“They” say… Miskatonic University, Arkham, Massachusetts…  is not bound by spacial and temporal limitations as “we” currently understand them; existing at a nexus between multiverses, in effect appearing where and when it is needed by the few individuals seeking ultimate expoundation upon their knowledge base. We’re not quite sure where this rhetoric comes from exactly, but we take it as a well earned compliment. Pre-contact, it can be said that MU’s prehistoric roots began growing near a sacred rock formation from the center of which emerged a bubbling spring, the tiny stream of which flowed gently to the river we know as the Miskatonic. This place became a small village of tribal elders from many distant tribes wise in the mostly-lost arts such as dreamwork, healing, and prophecy. After Dutch and English settlers arrived on the continent in the early 1600’s, suffice it to say… the native tribal peoples became displaced, and in the ensuing reoccupation of sites ever-held sacred to the tribes… the settlers built small schools for their youngsters amid and between their scattered settlements. One of these budding elementary schools was built very near the sacred rock formation, and over the decades it grew into a school for the higher education of the young… and on it grew, into a center of collegiate studies for adults seeking specialized skills… eventually evolving into the university it is today… all these hundreds of years later.

But during that development, it underwent many changes. In its early years, it was nothing more mysterious than a burgeoning epicenter of learning needing more and more expansion to accommodate an ever increasing influx of those seeking knowledge, those seeking fraternity, and of course… those yearning to profess! MU was molded by many an influence whose presence was not altogether welcome at other institutions of higher learning such as MU’s mundane contemporary—Harvard. Influences of all kinds struck this or that malleability into MU, from the contemporary religions of the first colonizers as well as the radical offshoot groups attractive to those of more individualized paths of faith… to what we hold as tried and true scientific knowledge as well as the often chaotic path of discovery and inquiry it takes… to artful endeavours in all their forms. Many of these more faintly acknowledged historically early groups are represented and honored today by way of the activities of the many clubs and societies that claim MU as their origin and home.

We hold true to MU’s roots! That is to say… the formation that long ago drew spiritual tribal elders from far off places to meet and share and collectively expound upon their secret hard-earned knowledge… this is the true heart of Miskatonic University! The beating of the drum that is the heartbeat of the land itself… its primal blood sputtering up from its cold dark depths… and meeting soon with the waters from much farther inland… together drifting to mix once again with its salty source. To honor MU is to honor these very roots… the indigenous people who have been here for thousands of years, since forever perhaps, the very first of humanity here and hopefully the last… who first held this place sacred and here shared their beliefs… the lush green land and all its critters that crawl and run and leap and fly… and the deep blue ocean and all its dark denizens… the sun in the sky that keeps our minds on our daily bread… and the distant star speckled unreachable black of night above. We desire that you will join us in our long tradition of holding true to MU’s roots as well, by asking the questions others dare not, and we look forward to meeting you soon!

First mention of “Miskatonic” and “Arkham”:
“It was to a time-battered edifice of this description that I was driven one afternoon in November, 1896, by a rain of such chilling copiousness that any shelter was preferable to exposure. I had been travelling for some time amongst the people of the Miskatonic Valley in quest of certain genealogical data; and from the remote, devious, and problematical nature of my course, had deemed it convenient to employ a bicycle despite the lateness of the season. Now I found myself upon an apparently abandoned road which I had chosen as the shortest cut to Arkham; overtaken by the storm at a point far from any town, and confronted with no refuge save the antique and repellent wooden building which blinked with bleared windows from between two huge leafless elms near the foot of a rocky hill. Distant though it was from the remnant of a road, the house none the less impressed me unfavourably the very moment I espied it. Honest, wholesome structures do not stare at travellers so slyly and hauntingly, and in my genealogical researches I had encountered legends of a century before which biassed me against places of this kind. Yet the force of the elements was such as to overcome my scruples, and I did not hesitate to wheel my machine up the weedy rise to the closed door which seemed at once so suggestive and secretive.” {H. P. Lovecraft, The Picture in the House (1920)]

First mention of “Miskatonic University”:
“Of Herbert West, who was my friend in college and in after life, I can speak only with extreme terror. This terror is not due altogether to the sinister manner of his recent disappearance, but was engendered by the whole nature of his life-work, and first gained its acute form more than seventeen years ago, when we were in the third year of our course at the Miskatonic University Medical School in Arkham. While he was with me, the wonder and diabolism of his experiments fascinated me utterly, and I was his closest companion. Now that he is gone and the spell is broken, the actual fear is greater. Memories and possibilities are ever more hideous than realities.” {H. P. Lovecraft, Herbert West—Reanimator (1921-22)]

Other HPL mentions of “Arkham” and/or “Miskatonic” (red underlined titles mention “Miskatonic University”)

The Unnamable (Sep 1923)
The Festival (Oct 1923):
“At the hospital they told me I had been found half frozen in Kingsport Harbour at dawn, clinging to the drifting spar that accident sent to save me. They told me I had taken the wrong fork of the hill road the night before, and fallen over the cliffs at Orange Point; a thing they deduced from prints found in the snow. There was nothing I could say, because everything was wrong. Everything was wrong, with the broad window shewing a sea of roofs in which only about one in five was ancient, and the sound of trolleys and motors in the streets below. They insisted that this was Kingsport, and I could not deny it. When I went delirious at hearing that the hospital stood near the old churchyard on Central Hill, they sent me to St. Mary’s Hospital in Arkham, where I could have better care. I liked it there, for the doctors were broad-minded, and even lent me their influence in obtaining the carefully sheltered copy of Alhazred’s objectionable Necronomicon from the library of Miskatonic University. They said something about a “psychosis”, and agreed I had better get any harassing obsessions off my mind.”

The Silver Key (1926)
The Strange High House in the Mist (Nov 1926)
The Colour Out of Space (Mar 1927):
“Nahum had come to town to tell people about the stone, and had dropped in at Ammi Pierce’s on the way. Ammi was forty then, and all the queer things were fixed very strongly in his mind. He and his wife had gone with the three professors from Miskatonic University who hastened out the next morning to see the weird visitor from unknown stellar space, and had wondered why Nahum had called it so large the day before. It had shrunk, Nahum said as he pointed out the big brownish mound above the ripped earth and charred grass near the archaic well-sweep in his front yard; but the wise men answered that stones do not shrink. Its heat lingered persistently, and Nahum declared it had glowed faintly in the night. The professors tried it with a geologist’s hammer and found it was oddly soft. It was, in truth, so soft as to be almost plastic; and they gouged rather than chipped a specimen to take back to the college for testing. They took it in an old pail borrowed from Nahum’s kitchen, for even the small piece refused to grow cool. On the trip back they stopped at Ammi’s to rest, and seemed thoughtful when Mrs. Pierce remarked that the fragment was growing smaller and burning the bottom of the pail. Truly, it was not large, but perhaps they had taken less than they thought.”

History of the Necronomicon (1927):
“In A.D. 950 the Azif, which had gained a considerable tho’ surreptitious circulation amongst the philosophers of the age, was secretly translated into Greek by Theodorus Philetas of Constantinople under the title Necronomicon. For a century it impelled certain experimenters to terrible attempts, when it was suppressed and burnt by the patriarch Michael. After this it is only heard of furtively, but (1228) Olaus Wormius made a Latin translation later in the Middle Ages, and the Latin text was printed twice—once in the fifteenth century in black-letter (evidently in Germany) and once in the seventeenth (prob. Spanish)—both editions being without identifying marks, and located as to time and place by internal typographical evidence only. The work both Latin and Greek was banned by Pope Gregory IX in 1232, shortly after its Latin translation, which called attention to it. The Arabic original was lost as early as Wormius’ time, as indicated by his prefatory note; and no sight of the Greek copy—which was printed in Italy between 1500 and 1550—has been reported since the burning of a certain Salem man’s library in 1692. An English translation made by Dr. Dee was never printed, and exists only in fragments recovered from the original manuscript. Of the Latin texts now existing one (15th cent.) is known to be in the British Museum under lock and key, while another (17th cent.) is in the Bibliothèque Nationale at Paris. A seventeenth-century edition is in the Widener Library at Harvard, and in the library of Miskatonic University at Arkham. Also in the library of the University of Buenos Ayres. Numerous other copies probably exist in secret, and a fifteenth-century one is persistently rumoured to form part of the collection of a celebrated American millionaire. A still vaguer rumour credits the preservation of a sixteenth-century Greek text in the Salem family of Pickman; but if it was so preserved, it vanished with the artist R.U. Pickman, who disappeared early in 1926. The book is rigidly suppressed by the authorities of most countries, and by all branches of organised ecclesiasticism. Reading leads to terrible consequences. It was from rumours of this book (of which relatively few of the general public know) that R.W. Chambers is said to have derived the idea of his early novel The King in Yellow.”

The Dunwich Horror (1928):
“Outsiders visit Dunwich as seldom as possible, and since a certain season of horror all the signboards pointing toward it have been taken down. The scenery, judged by any ordinary aesthetic canon, is more than commonly beautiful; yet there is no influx of artists or summer tourists. Two centuries ago, when talk of witch-blood, Satan-worship, and strange forest presences was not laughed at, it was the custom to give reasons for avoiding the locality. In our sensible age—since the Dunwich horror of 1928 was hushed up by those who had the town’s and the world’s welfare at heart—people shun it without knowing exactly why. Perhaps one reason—though it cannot apply to uninformed strangers—is that the natives are now repellently decadent, having gone far along that path of retrogression so common in many New England backwaters. They have come to form a race by themselves, with the well-defined mental and physical stigmata of degeneracy and inbreeding. The average of their intelligence is woefully low, whilst their annals reek of overt viciousness and of half-hidden murders, incests, and deeds of almost unnamable violence and perversity. The old gentry, representing the two or three armigerous families which came from Salem in 1692, have kept somewhat above the general level of decay; though many branches are sunk into the sordid populace so deeply that only their names remain as a key to the origin they disgrace. Some of the Whateleys and Bishops still send their eldest sons to Harvard and Miskatonic, though those sons seldom return to the mouldering gambrel roofs under which they and their ancestors were born.”

The Whisperer in Darkness (1930):
“The whole matter began, so far as I am concerned, with the historic and unprecedented Vermont floods of November 3, 1927. I was then, as now, an instructor of literature at Miskatonic University in Arkham, Massachusetts, and an enthusiastic amateur student of New England folklore. Shortly after the flood, amidst the varied reports of hardship, suffering, and organised relief which filled the press, there appeared certain odd stories of things found floating in some of the swollen rivers; so that many of my friends embarked on curious discussions and appealed to me to shed what light I could on the subject. I felt flattered at having my folklore study taken so seriously, and did what I could to belittle the wild, vague tales which seemed so clearly an outgrowth of old rustic superstitions. It amused me to find several persons of education who insisted that some stratum of obscure, distorted fact might underlie the rumours.”

At the Mountains of Madness (Feb-March 1931):
“It is further against us that we are not, in the strictest sense, specialists in the fields which came primarily to be concerned. As a geologist my object in leading the Miskatonic University Expedition was wholly that of securing deep-level specimens of rock and soil from various parts of the antarctic continent, aided by the remarkable drill devised by Prof. Frank H. Pabodie of our engineering department. I had no wish to be a pioneer in any other field than this; but I did hope that the use of this new mechanical appliance at different points along previously explored paths would bring to light materials of a sort hitherto unreached by the ordinary methods of collection. Pabodie’s drilling apparatus, as the public already knows from our reports, was unique and radical in its lightness, portability, and capacity to combine the ordinary artesian drill principle with the principle of the small circular rock drill in such a way as to cope quickly with strata of varying hardness. Steel head, jointed rods, gasoline motor, collapsible wooden derrick, dynamiting paraphernalia, cording, rubbish-removal auger, and sectional piping for bores five inches wide and up to 1000 feet deep all formed, with needed accessories, no greater load than three seven-dog sledges could carry; this being made possible by the clever aluminum alloy of which most of the metal objects were fashioned. Four large Dornier aëroplanes, designed especially for the tremendous altitude flying necessary on the antarctic plateau and with added fuel-warming and quick-starting devices worked out by Pabodie, could transport our entire expedition from a base at the edge of the great ice barrier to various suitable inland points, and from these points a sufficient quota of dogs would serve us.”

“” 508. TO AUGUST DERLETH
Novr. 6, 1931 Dear A. W.:—
… About “Arkham” and “Kingsport”—bless my soul! but I thought I’d told you all about them years ago! They are typical but imaginary places—like the river “Miskatonic”, whose name is simply a jumble of Algonquin roots ^[1]. Vaguely, “Arkham” corresponds to Salem (though Salem has no college), while “Kingsport” corresponds to Marblehead. Similarly, there is no “Dunwich”—the place being a vague echo of the decadent Massachusetts countryside around Springfield—say Wilbraham, Monson, and Hampden. It would be impossible to make any real place the scene of such bizarre happenings as those which beset my hypothetical towns. At the same time, I take pains to make these places wholly and realistically characteristic of genuine New England seaports—always being authentic concerning architecture, atmosphere, dialect, manners and customs, &c. As for that rocky promontory—the coast north of Boston is composed of high rocky cliffs, which in several places rise to considerable altitudes as bold headlands. Of course, though, there is nothing as dizzy as the fabled seat of the Strange High House. If I had any promontory specifically in mind when writing that tale, it was the headland near Gloucester called “Mother Ann”—though that has no such relation to the city as my mysterious cliff has to “Kingsport”. Marblehead has rocky cliffs—though of no great height—along the neck to the south of the ancient town. … Best wishes—Yr. obt. Servt., HP “” {H. P. Lovecraft, H. P. Lovecraft Selected Letters III (1929-1931)]

• [1] “Two months from then, by Night, there was heard a Band of Wampanaug Salvages ^[1.1] howling and singing in the Woods; and it appeared, they took down the Ring of Stones and did much besides. For their head Man Misquamacus, that same antient Wonder-Worker of whom Billington had learnt some of his Sorceries, came shortly into the town and told Mr. Bradford some strange Things; namely, that Billington had done worse Evill than cou’d be well repair’d, and that he was no doubt eat up by what he had call’d out of the Sky. That there was no Way to send back that Thing he had summon’d, so the Wampanaug wise Men had caught and prison’d it where the Ring of Stones had been.” {HPL, “Of Evill Sorceries done in New England, of Daemons in No Humane Shape” (writ mid-1930’s; fragment from which August Derleth wrote “The Lurker at the Threshold” [1st published (1945) by Arkham House in a hardcover edition the 2nd of two volumes The Lurker at the Threshold in the “Library of Arkham House Novels of Fantasy and Terror” (limited to 3,041 copies); Witch House (1st volume, Evangeline Walton, 1945); Conjure Wife (3rd volume, Fritz Leiber Jr., unpublished, announced in the earlier books in the series as forthcoming, listed as a “Lost Arkham” in S.T. Joshi’s Sixty Years of Arkham House (1999), the novel was Leiber’s first and was first published in the April 1943 edition of Unknown, on it three films are based: Weird Woman (1944), Night of the Eagle (also known as Burn, Witch, Burn!) (1962), and Witches’ Brew (also known as Which Witch is Which?) (1980))]
• [1.1] The native American tribe of Wampanoag people are of the Algonquian family of languages which includes Massachusett and Narragansett; Wampanoag homeland wais ^[1.1.1] primarily located in southeastern Massachusetts and eastern Rhode Island and the outlying islands.
• [1.1.1] I coined the word “wais” to meet an otherwise unfulfilled literary need… look to the following publication for deep rabbit holes… “” [5.2 (from “and consecrated Rhea Ilia Silvia… [….] priestess of Vesta ^[5.2]“] Rarely depicted in human form, Vesta ^[E], the virgin deity of the hearth… the center of home and family… wais ^[5.2.1] more oft thought of as the fire of her temple, which entry to was only given to her priestesses, the Vestal Virgins; these girls were usually chosen while pre-pubescent, and were responsible for keeping the temple flame alive. If the flame ever went out, the vestals were whipped. Worse yet, if a vestal lost her chastity, she was guilty of incestum, and she was buried alive, whereas her sexual partner was publicly beaten to death. Continued… “” {T^Boan‘s 366 Daily Ink Monsters Productivity Planner Coloring Book, Volume 1.1: January – June, Gregorian Version (forthcoming!)]

The Shadow over Innsmouth (Nov-Dec 1931):“Most interesting of all was a glancing reference to the strange jewellery vaguely associated with Innsmouth. It had evidently impressed the whole countryside more than a little, for mention was made of specimens in the museum of Miskatonic University at Arkham, and in the display room of the Newburyport Historical Society. The fragmentary descriptions of these things were bald and prosaic, but they hinted to me an undercurrent of persistent strangeness. Something about them seemed so odd and provocative that I could not put them out of my mind, and despite the relative lateness of the hour I resolved to see the local sample—said to be a large, queerly proportioned thing evidently meant for a tiara—if it could possibly be arranged.“

The Dreams in the Witch House (1932):
“Possibly Gilman ought not to have studied so hard. Non-Euclidean calculus and quantum physics are enough to stretch any brain; and when one mixes them with folklore, and tries to trace a strange background of multi-dimensional reality behind the ghoulish hints of the Gothic tales and the wild whispers of the chimney-corner, one can hardly expect to be wholly free from mental tension. Gilman came from Haverhill, but it was only after he had entered college in Arkham that he began to connect his mathematics with the fantastic legends of elder magic. Something in the air of the hoary town worked obscurely on his imagination. The professors at Miskatonic had urged him to slacken up, and had voluntarily cut down his course at several points. Moreover, they had stopped him from consulting the dubious old books on forbidden secrets that were kept under lock and key in a vault at the university library. But all these precautions came late in the day, so that Gilman had some terrible hints from the dreaded Necronomicon of Abdul Alhazred, the fragmentary Book of Eibon, and the suppressed Unaussprechlichen Kulten of von Junzt to correlate with his abstract formulae on the properties of space and the linkage of dimensions known and unknown.“

Through the Gates of the Silver Key (1932–1933); herein also… the Miskatonic River is mentioned for the last time:
“Gilman awakened in his bed, drenched by a cold perspiration and with a smarting sensation in his face, hands, and feet. Springing to the floor, he washed and dressed in frantic haste, as if it were necessary for him to get out of the house as quickly as possible. He did not know where he wished to go, but felt that once more he would have to sacrifice his classes. The odd pull toward that spot in the sky between Hydra and Argo had abated, but another of even greater strength had taken its place. Now he felt that he must go north—infinitely north. He dreaded to cross the bridge that gave a view of the desolate island in the Miskatonic, so went over the Peabody Avenue bridge. Very often he stumbled, for his eyes and ears were chained to an extremely lofty point in the blank blue sky.“

In addition to regarding this “desolate island in the Miskatonic” which you can see on HPL’s map of Arkham, which HPL drew in early 1934.

“One thing I did lately was to construct a Map of Arkham, so that allusions in any future tale I may write may be consistent.” {HPL to Wandrei (Mar 28, 1934)]

HPL’s “Map of Arkham”, 1st published in The Acolyte, Vol. 1, No. 1 (Fall 1942)

There is also a clue as to the age of “Miskatonic University—Quadrangle & Campus”; notice “French Doctor’s house (gardens)” on “French Hill”.

Our clue, while not “definitive” by any stretch (but it is a solid enough foundation from which we can build a believable enough chronology true to Lovecraft’s own material), is “” “House 1698-9. “” (we can thus deduce MU was founded well before 1698)… found in August Derleth’s “Final Notes” from The Dark Brotherhood and Other Pieces by H. P. Lovecraft & Divers Hands (Arkham House: Publishers; Sauk City, Wisconsin; 1966):
“” In regard to the Lovecraft notes for The Survivor—Lovecraft’s own title, it should be observed, the late R. H. Barlow has left this explanation: “This syllabus, penciled on the blank portions of a newspaper cartoon, hints at plans for a last, never-written story.  Lovecraft spoke of it with some fullness one afternoon in 1934, but since I expected to read it in a few months or a year, I retained only casual impressions of the shape it was to have been. Inspired by an actual 17th-century house in the Quebec style which interrupts a staid New England street, the tale dealt with a French wizard who sought to duplicate in himself the fabulous longevity of a crocodile, but who succeeded in only changing his form to a hideous extent. I remember there was to have been a scene where some one glimpsed the bent reptilian figure as it hurried across a miasmatic garden behind the strange house, to vanish in the well-mouth which its condition dictated as habitat; but I cannot establish other details.”

The complete Lovecraft notes out of which, together with Barlow’s memory of his conversation with Lovecraft, The Survivor [written by August Derleth; 1st published in Weird Tales (July 1954 issue)] was actually written as a posthumous collaboration, are:

“Jean-Francois Charriére.
“Surgeon.
“Studies crocodile and gavial.
“B. 1636. Bayonne. Anci Lapurdum.
“Elder secrets hinted.
“Paris 1653. Aet. 17.
“Study’d under Richd. Wiseman, Royalist exile in France. Ante 1660.
“Had been surgeon with Fr. army in India. Pondicherry-Caromandall Coast 1674 & (1683).
“Quebec 1691.
“Arkham 1697.
“House 1698-9.
“Climax 1708.
“1708
  1636
      72
  ___
“Have deteriorative evolution (towards croc.) occur in tomb.” “”

The Thing on the Doorstep (1933) [first to mention “Arkham Sanitarium”]:
“Derby went through Miskatonic University in Arkham, since his parents would not let him board away from them. He entered at sixteen and completed his course in three years, majoring in English and French literature and receiving high marks in everything but mathematics and the sciences. He mingled very little with the other students, though looking enviously at the “daring” or “Bohemian” set—whose superficially “smart” language and meaninglessly ironic pose he aped, and whose dubious conduct he wished he dared adopt.“

The Shadow Out of Time (1934–1935… read this before you ever read August W. Derleth’s The Shadow Out of Space, in which Derleth takes HPL’s The Shadow Out of Time and grants unto it an anti-Lovecraftian aspect of morality):
“These pages—much in whose earlier parts will be familiar to close readers of the general and scientific press—are written in the cabin of the ship that is bringing me home. I shall give them to my son, Prof. Wingate Peaslee of Miskatonic University—the only member of my family who stuck to me after my queer amnesia of long ago, and the man best informed on the inner facts of my case. Of all living persons, he is least likely to ridicule what I shall tell of that fateful night. I did not enlighten him orally before sailing, because I think he had better have the revelation in written form. Reading and re-reading at leisure will leave with him a more convincing picture than my confused tongue could hope to convey. He can do as he thinks best with this account—shewing it, with suitable comment, to any quarters where it will be likely to accomplish good. It is for the sake of such readers as are unfamiliar with the earlier phases of my case that I am prefacing the revelation itself with a fairly ample summary of its background.“

Other authoritative mentions of “Miskatonic University” include:

August W. Derleth; “The Return of Hastur” [1st published in Weird Tales (March 1939)] — “The Sandwin Compact” [1st published in Weird Tales (Nov 1940 issue)] — “Beyond the Threshold” [1st published in Weird Tales (Sep 1941 issue)] —“The House on Curwen Street” [1st published as “The Trail of Cthulhu” Weird Tales (Mar 1944 issue), and then in The Trail of Cthulhu (Arkham House, 1962)] — “The Dweller in Darkness”  [1st published in Weird Tales (Nov 1944 issue)] — “The Lurker at the Threshold” [1st published (1945) by Arkham House in a hardcover edition the second of two volumes in the “Library of Arkham House Novels of Fantasy and Terror” (limited to 3,041 copies) {posthumous “collaboration” ^[2]… Derleth made a habit of making money after Lovecraft’s death by taking several of HPL’s story ideas or notes, and writing stories inspired by or related to them, and then attributing their authorship to himself and Lovecraft—or Lovecraft alone}] — “The Watcher from the Sky: The Deposition of Abel Keane” [1st published in Weird Tales (July 1945 issue), the second part of August Derleth’s The Trail of Cthulhu series, following “The House on Curwen Street”, and followed by “The Gorge Beyond Salapunco”] — “Something in Wood” [1st published in Weird Tales (March 1948 issue)] — “The Gorge Beyond Salapunco” [1st published in Weird Tales (Mar 1949 issue)] — “The Adventure of the Six Silver Spiders” [1st published in Ellery Queen’s Mystery Magazine (Oct 1950 issue),“On hearing that Doyle did not plan to write more Sherlock Holmes stories, the young Derleth wrote to him, asking permission to take over the series. Doyle graciously declined, but Derleth, despite having never been to London, set about finding a name that was syllabically similar to “Sherlock Holmes”, and wrote his first set of pastiches in 1928, which were published in The Dragnet Magazine in 1929. He would ultimately write more stories about Pons than Conan Doyle did about Holmes.“ {https://en.wikipedia.org/wiki/Solar_Pons]] — “The Keeper of the Key” [1st published in Weird Tales (May 1951 issue)] — “The House in the Valley” [1st published in Weird Tales (July 1953 issue)] — “The Shadow Out of Space” [1st published in The Survivor and Others (1957)] — “The Gable Window” [1st published in Saturn as “The Murky Glass” (May 1957 issue)] — “The Seal of R’lyeh” [1st published as “The Seal of the Damned” in Fantastic Universe Science Fiction (July 1957 issue)] — “The Shuttered Room” [1st published in The Shuttered Room and Other Pieces (Arkham House, 1959)] — “Witches’ Hollow” [1st published in Dark Mind, Dark Heart (Arkham House, 1962)] — “The Shadow in the Attic” [1st published in Over the Edge (Arkham House, 1964)] — “The Watchers Out of Time” [1st published in The Watchers Out of Time and Others (Arkham House, 1974), the story is at the end of the book and was left incomplete and unfinished at the time of Derleth’s death (February 24, 1909 – July 4, 1971), although it is… somewhat… finished in T^Boan’s Lovecraft Anthology Volume I (forthcoming!)]

[2] Regarding these posthumous “collaborations”… “” […] the status of these works as collaborations with Lovecraft was swiftly disputed after Derleth’s death. Subsequent critics consider them part of the Cthulhu Mythos, but often split this into the original “Lovecraft Mythos” and the later and lesser ^[2.1] “Derleth Mythos”. ^[2] “” {https://en.wikipedia.org/wiki/H._P._Lovecraft_bibliography]

[2] “” These sixteen stories, listed as by “H.P. Lovecraft and August Derleth”, were in fact written almost entirely by Derleth. In most cases, the stories were based on one or more ideas noted in Lovecraft’s Commonplace Book; for example, “The Fisherman of Falcon Point” was based on this entry: “Fisherman casts his net into the sea by moonlight—what he finds.” Plotting, description, dialogue, characterization, and other elements were entirely by Derleth. As such they cannot be classified as works by Lovecraft. In some instances Derleth incorporated actual prose passages by Lovecraft into his stories. The Lurker at the Threshold (a 50,000-word novel) contains about 1,200 words by Lovecraft, most of it taken from a fragment entitled “Of Evill Sorceries Done in New England” (see B-i-42), the balance from a fragment now titled “The Rose Window” (see B-ii-322). “The Survivor” was based on a comparatively lengthy plot sketch plus random notes for the story jotted down by Lovecraft in 1934. A descriptive passage of “The Lamp of Alhazred” was based on a portion of a letter by Lovecraft to Derleth, November 18, 1936. These extracts or paraphrases, however, have not been deemed significant enough to merit inclusion in this bibliography. “” {S. T. Joshi, H.P. Lovecraft : A Comprehensive Bibliography (Tampa, FL: University of Tampa Press (2009)] 

The 16 stories S. T. Joshi speaks of, are:

• • • The Lurker at the Threshold (1945)
    • “The Survivor” (1954)
    • “The Ancestor” (1957)
    • “The Gable Window” (1957)
    • “The Lamp of Alhazred” (1957)
    • “The Peabody Heritage” (1957)
    • “The Shadow Out of Space” (1957)
    • “Wentworth’s Day” (1957)
    • “The Fisherman of Falcon Point” (1959)
    • “The Shuttered Room” (1959)
    • “Witches’ Hollow” (1962)
    • “The Shadow in the Attic” (1964)
    • “The Dark Brotherhood” (1966)
    • “The Horror from the Middle Span” (1974)
    • “Innsmouth Clay” (1974)
    • “The Watchers Out of Time” (1974, unfinished before Derleth’s death on July 4, 1971; although it is… somewhat… finished in T^Boan’s Lovecraft Anthology Volume I (forthcoming!)])

[2.1] This is of course an opinion (the Wiki-contributor’s opinion), but it is written in such a way and accompanied by a foot-note such that the reader might be led to believe it is the opinion of S. T. Joshi, rather than or in addition to, that of the Wiki-contributor alone… and that, my friends… is very poor literary form!

Fritz Leiber; “To Arkham and the Stars” [1st published in The Dark Brotherhood and Other Pieces by H. P. Lovecraft & Divers Hands (Arkham House: Publishers; Sauk City, Wisconsin; 1966)] — “The Terror from the Depths” [1st published in The Disciples of Cthulhu (1976)]

Robert A. W. Lowndes; “Settler’s Wall” (two revised versions of the original story, “The Long Wall” [1st published in Stirring Science Stories (Mar 1942 issue) as by Wilfred Owen Morley])… 1st published in Startling Mystery Stories #10 (1968), and then in Crypt of Cthulhu #62 (1989), and in The Necronomicon: Selected Stories and Essays Concerning the Blasphemous Tome of the Mad Arab (Edited by Robert M. Price; Oakland: Chaosium, Inc.; 1996):

“” “Yes, Clyde, I’m a certified Bachelor of Arts, graduated summa cum laude from Columbia in 1931. I’m a real Latin scholar — or I would have been. Can you think of any other specialty more useless in these times ? I was a fool not to switch in 1930 to something more practical — that’s why I don’t like to talk about college. But I did want to see if Dave was around. He’d concentrated on Latin, too, before he transferred to Columbia. I forget where he’d gone before. He didn’t talk much about it, but he learned a lot of obscure Latin there.”

“I’ve heard it mentioned,” Wing said. “Housatonic? No — that’s in Connecticut and a river, not a school. Something like that. It was around Massachusetts Bay, not too far from Marblehead. . . . But I’ve dragged you away from what you were telling about the wall. Did you try anything else ?”
….
“And if you want my opinion — because that’s all it is, I don’t know — I think the reason why Dave left that college in Massachusetts and shifted to New York was because he found out too much and had the sense to stop before he went off his head like Jim Garlan. They had old books locked up at that college, too, and what we could read of Dave’s notebooks says that he got to see some of them. Well, the major and I, we both calculated a bit, and we figure that the books Dave was reading in corrupt Latin in 1926 and 1927 was the same books that Jim Garlan found in London. They were real old books, copied out by hand. . . . Dave used to correspond with a writer who lived in Rhode Island, and he’d get long letters from him every now and then. But when he came back from that place, he was a different person. He burned all the correspondence and I think he might have burned the notebooks, too, except perhaps he figured that no one could read them, and there were some things in them — personal things — that he didn’t want to lose. Maybe he’d have copied those out and burned the rest if he’d lived. I don’t know. One of those things where you have to say that just nobody knows, that’s all.” “”

J. Vernon Shea; “The Haunter of the Graveyard” [1st published in Tales of the Cthulhu Mythos (Edited by August Derleth; Arkham House, 1969)]

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