[I reproduce below S. T. Joshi's "A Note on the Texts" for this edition:]
In this corrected edition of H. P. Lovecraft's revisions and collaborations, we have attempted not merely to restore the texts but to arrange the tales in accordance with the presumed degree of Lovecraft's involvement with them. What we have called "primary" revisions are those that were wholly or almost wholly written by Lovecraft (although a plot-germ or occasionally an actual draft was supplied by the revision client); the "secondary" revisions are those in which Lovecraft merely touched up--albiet sometimes extensively--a preexisting draft.
The two collaborations with Winifred Virginia Jackson, "The Green Meadow" and "The Crawling Chaos," are interesting in that they are among the few works (the others are "Poetry and the Gods," "Through the Gates of the Silver Key," and "In the Walls of Eryx") where Lovecraft affixed his name along with that of his collaborator, even though here both used pseudonyms. Nevertheless, there is little evidence to suggest that Jackson contributed any prose to either tale.
For the two tales revised for Adolphe de Castro, "The Last Test" and "The Electric Executioner," we have de Castro's original versions; they were published in his collection IN THE CONFESSIONAL (1893), under the titles "A Sacrifice to Science" and "Automatic Executioner." Lovecraft has rewritten both stories completely, preserving only the skeleton of each work. It should be noted that in Lovecraft's only reference to the first tale he calls it "Clarendon's Last Test"; it is not certain whether he or someone else made the change. Lovecraft also speaks in letters of a third story revised for de Castro, but this has evidently been lost.
All three stories revised for Zealia Bishop--"The Curse of Yig," "The Mound," and "Medusa's Coil"--were, as Lovecraft notes, based on the scantiest of plot-germs and are accordingly close to original works by Lovecraft. The persistent rumor that Frank Belknap Long assisted in the writing of "The Mound" is false; Long, as Zelia Bishop's agent, merely abridged the story in a vain attempt to place it with a pulp magazine; after these efforts failed, the original version of the story as written by Lovecraft was restored, remaining in manuscript until Lovecraft's death. August Derleth then radically revised and abridged both "The Mound" and "Medusa's Coil" and marketed them to Weird Tales. This edition represents the first unadulterated publication of both works.
There is abundant evidence that Lovecraft wrote nearly the entirety of all five stories revised for Hazel Heald; Heald's contention that Lovecraft's role in "The Man of Stone" was somewhat less extensive than in the others does not seem to be borne out by the text.
For "The Diary of Alonzo Typer" we have both a draft by William Lumley (the title is his) and Lovecraft's rewriting. Again Lovecraft has preserved only the nucleus of the plot, and all the prose is his. Lumley's draft was first published (along with the original versions of the two Adolphe de Castro tales) in a special edition of Crypt of Cthulhu, ASHES AND OTHERS (1982).
Of the secondary revisions, Sonia H. Greene (Davis) reports that Lovecraft "revised and edited" "The Horror at Martin's Beach" (the title "The Invisible Monster" was supplied by Weird Tales), hence we can assume a preexisting draft. The other tale by Greene thought to be revised by Lovecraft, "Four O'Clock," was written, as Greene tells us, only at Lovecraft's suggestion and does not seem to bear any Lovecraftian prose or content; it has accordingly been omitted from this edition.
In recent years Lovecraft's revisory hand has been detected in a number of tales by his friends and colleagues, and five stories have been added to this edition. Kenneth W. Faig, Jr., first observed that Lovecraft in letters refers to four tales revised for C. M. Eddy, Jr.; all were probably based on existing drafts by Eddy, who wrote many tales in his own right. "Ashes" appears to be the earliest of these stories, and Lovecraft's hand in it is probably very light. In the other three--"The Ghost Eaters," "The Loved Dead," and "Deaf, Dumb, and Blind"--the two authors probably contributed equally.
It is difficult to ascertain how much of Lovecraft remains in Wilfred Blanch Talman's "Two Black Bottles," as Lovecraft's letters suggest that Talman was annoyed at Lovecraft's extensive revisions in the story and may perhaps have reinstated his own prose in the final draft.
I discovered Lovecraft's role in Henry S. Whitehead's "The Trap"; in a letter to R. H. Barlow (25 February 1932)he reports writing the entire central section of the story. In letters Lovecraft refers to another story by Whitehead, "The Bruise," for which he supplied a synopsis; and although William Fulwiler, who brought this matter to our attention, believes that Lovecraft may have actually written the story (published as "Bothon" in WEST INDIA LIGHTS), I am not convinced that Lovecraft contributed any prose to this work.
Lovecraft's letters to Duane W. Rimel indicate that e was reading and reviewing many of Rimel's tales during the 1930s, and in two of them he seems to have had a hand. Scott Connors noted Lovecraft's involvement in "The Tree on the Hill," and Robert M. Price and I confirmed it. Rimel has stated that Lovecraft wrote the entire third section of the tale, as well as the citation from the mythical CHRONICLE OF NATH in the second section. Will Murray first suspected, on internal evidence, Lovecraft's role in "The Disinterment." Rimel maintains that Lovecraft's revisions in the story were very light, and letters by Lovecraft unearthed by Murray and myself appear to confirm that claim.
For R. H. Barlow's "'Till A' the Seas" we have a typescript by Barlow (apparently a second draft) with exhaustive revisions by Lovecraft in en. Dirk W. Mosig discovered Lovecraft's hand in Barlow's "The Night Ocean," as cited in a letter to Hyman Bradofsky (4 November 1936). Mosig believed the tale to be nearly entirely written by Lovecraft; but documents subsequently consulted by me suggest that he played a much smaller role in the genesis and writing of the tale. The work was probably largely Barlow's, although with heavy revisions and additions by Lovecraft at random points.
For a more detailed discussion of the degree of Lovecraft's involvement in these stories, see my article "Lovecraft's Revisions: How Much of Them Did He Write?" Crypt of Cthulhu 2 (Candlemas 1983): 3-14.
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This is an excellent collection of Lovecraftian weird fiction. All of Lovecraft's revisions and collaborations have now been edited and annotated by S. T. for a two volume set to be published by Arcane Wisdom Press, the first volume of which will be published this year (2011).