The brother of the narrator is prescribed a drug by his doctor, but the lot given him has degraded in such a way as to become the same potion given victims at the historical Witches' Sabbaths, resulting in his physical degeneration but inability to stop taking it.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1895 |
|
The Three Imposters; or, The Transmutations | John Lane | Collection | 206 |
| 1895 | The Three Imposters; or, The Transmutations | Roberts Brothers | Collection | 155 | |
| 1906 | The House of Souls | E. Grant Richards | Omnibus | 416 | |
| 1906 |
|
The House of Souls | E. Grant Richards | Collection | 416 |
| 1923 |
|
The House of Souls | Grant Richards | Collection | 416 |
| August 1923 |
|
The Three Impostors | Alfred A. Knopf | Omnibus | 163 |
| 1926 | The Three Impostors | Martin Secker | Collection | ||
| 1927 | The Three Impostors | Alfred A. Knopf | Omnibus | ||
| 1927 |
|
More Ghosts and Marvels: A Selection of Uncanny Tales from Walter Scott to Michael Arlen | Oxford University Press | Anthology | 282 |
| August 1929 |
|
Beware After Dark!: The World's Most Stupendous Tales of Mystery, Horror, Thrills and Terror | The Macaulay Company | Anthology | 260 |
| 1930 | The Three Impostors | Alfred A. Knopf | Omnibus | ||
| 1936 | The House of Souls | The Richards Press | Collection | 416 | |
| 1938 | The Three Impostors | Alfred A. Knopf | Omnibus | ||
| September 1944 |
|
Famous Fantastic Mysteries, September 1944 | All-Fiction Field, Inc. | MAGAZINE | 111 |
| 1945 |
|
Beware After Dark!: The World's Most Stupendous Tales of Mystery, Horror, Thrills and Terror | Emerson | Anthology | 260 |
| June 1945 |
|
Super Science and Fantastic Stories, June 1945 | Popular Publications, Inc.; Toronto, Canada | MAGAZINE | 37 |
| 1946 |
|
Strange and Fantastic Stories: Fifty Tales of Terror, Horror and Fantasy | Whittlesey House | Anthology | 482 |
| 1948 |
|
Tales of Horror and the Supernatural | Alfred A. Knopf | Collection | |3 |
| 1948 |
|
Tales of Horror and the Supernatural | Alfred A. Knopf | Collection | |3 |
| 1948 |
|
Tales of Horror and the Supernatural | Alfred A. Knopf | Collection | |3 |
| 1949 | Tales of Horror and the Supernatural | The Richards Press | Collection | ||
| 1950 |
|
Ghostly Tales to Be Told | Dodd, Mead & Co. | Anthology | 187 |
| 1960 |
|
The Strange World of Arthur Machen | Juniper Press | Omnibus | |206 |
| 1961 |
|
Spine Chillers: An Anthology of Mystery and Horror | Elek Books | Anthology | 182 |
| September 1962 |
|
Ghosts and Things | Berkley Medallion | Anthology | 65 |
| 1964 | Tales of Horror and the Supernatural | John Baker | Collection | 43 | |
| 1964 | The Three Impostors | John Baker | Collection | 144 | |
| 1965 |
|
Monster Festival | Vanguard Press | Anthology | 105 |
| 1965 |
|
The Novel of the White Powder | Corgi | Collection | 9 |
| 1966 |
|
Black Crusade | Corgi | Collection | 114 |
| 1969 |
|
Die leuchtende Pyramide und andere Geschichten des Schreckens | Insel | Collection | 32 |
| 1970 |
|
De grote God Pan | Bruna | Collection | 43 |
| 1970 |
|
Tales of Horror and the Supernatural | John Baker | Collection | 43 |
| September 1970 | Ghosts and Things | Berkley Medallion | Anthology | 65 | |
| June 1972 |
|
The Three Impostors | Ballantine Books | Omnibus | 114 |
| 1973 |
|
Strange Ecstasies: Stories About Strange and Unearthly Drugs | Panther | Anthology | 36 |
| December 1973 |
|
Tales of Horror and the Supernatural: Volume 2 | Pinnacle Books | Collection | 53 |
| 1974 |
|
Uncanny | Blackie & Son | Anthology | 13 |
| October 1974 |
|
Strange Ecstasies | Pinnacle Books | Anthology | 33 |
| 1975 |
|
Tales of Horror and the Supernatural: Volume 2 | Panther | Collection | 49 |
| 1975 |
|
Living in Fear: A History of Horror in the Mass Media | Charles Scribner's Sons | Nonfiction | 93 |
| August 1976 | Tales of Horror and the Supernatural: Volume 2 | Pinnacle Books | Collection | 53 | |
| June 1977 |
|
The Best Ghost Stories | Hamlyn | Anthology | 224 |
| September 1977 |
|
I tre impostori | Fanucci Editore | Collection | 199 |
| June 1978 |
|
La pyramide de feu | Retz-Franco Maria Ricci | Collection | 139 |
| 1980 |
|
Van Edgar Allan Poe tot Roald Dahl: De vijftig beste griezel-verhalen | Publiboek / Baart | Anthology | 174 |
| October 1981 |
|
Histoires de maléfices | Presses Pocket | Anthology | 103 |
| February 1982 |
|
Die leuchtende Pyramide und andere Geschichten des Schreckens | Suhrkamp | Collection | 38 |
| May 1982 |
|
Il gran Dio Pan e altre storie soprannaturali | Mondadori | Collection | 134 |
| November 1983 |
|
Tales of Horror and the Supernatural | Pinnacle Books | Collection | 213 |
| November 1984 |
|
Phantastische Welten | Suhrkamp | Anthology | 308 |
| 1985 |
|
Phantastische Welten | Suhrkamp | Anthology | 308 |
| September 1987 |
|
Devils & Demons: A Treasury of Fiendish Tales Old & New | Doubleday / SFBC | Anthology | 212 |
| September 1987 |
|
Tales of the Dark #2 | St. Martin's Press | Anthology | 103 |
| September 1987 |
|
Devils & Demons: A Treasury of Fiendish Tales Old & New | Doubleday | Anthology | 212 |
| February 1991 |
|
I tre impostori | Fanucci Editore | Collection | 199 |
| August 1991 |
|
Famous Fantastic Mysteries | Gramercy Books | Anthology | 198 |
| May 1993 |
|
Storie di fantasmi: antologia di racconti anglosassoni del soprannaturale | Einaudi | Anthology | 157 |
| 1997 |
|
Tales of Horror and the Supernatural | Tartarus Press | Collection | 41 |
| February 1997 |
|
La grande anthologie du fantastique: 3 | Omnibus (France) | Anthology | 1002 |
| 1998 | Tales of Horror and the Supernatural | Tartarus Press | Collection | 41 | |
| April 2001 |
|
The Three Impostors and Other Stories | Chaosium | Omnibus | 196 |
| April 2004 |
|
I tre impostori | Fanucci Editore | Collection | 145 |
| November 2005 |
|
H.P. Lovecraft's Favorite Weird Tales: The Roots of Modern Horror | Cold Spring Press | Anthology | 87 |
| August 2006 |
|
H. P. Lovecraft's Book of the Supernatural: 20 Classics of the Macabre, Chosen by the Master of Horror Himself | Pegasus Books | Anthology | |
| September 2006 |
|
H. P. Lovecraft's Book of the Supernatural: 20 Classics of the Macabre, Chosen by the Master of Horror Himself | Pegasus Books | Anthology | 461 |
| June 2007 |
|
H. P. Lovecraft's Book of the Supernatural: 19 Classics of the Macabre, Chosen by the Master of Horror Himself | Fall River Press | Anthology | 329 |
| December 2010 |
|
The Three Impostors | Wildside Press | Omnibus | |
| March 2011 | The Three Imposters; or, The Transmutations | Project Gutenberg | Collection | ||
| September 2011 |
|
The White People and Other Weird Stories | Penguin Books (US) | Collection | |6 |
| December 2011 |
|
The White People and Other Weird Stories | Penguin Books | Collection | 67 |
| December 2011 |
|
The Three Impostors | Jimcin Recordings | Collection | |139 |
| January 2012 |
|
The Ghost of Fear and Others | Dark Renaissance Books | Anthology | |
| June 2012 |
|
Arthur Machen: Masters of the Weird Tale | Centipede Press | Omnibus | |13 |
| February 2014 |
|
The Three Impostors | Aziloth Books | Collection | |
| May 2014 |
|
The Three Imposters | Flame Tree 451 | Collection | |
| October 2014 |
|
Horror Stories: Classic Tales from Hoffmann to Hodgson | Oxford University Press | Anthology | 294 |
| November 2016 |
|
The Ghost of Fear and Others | Dark Regions Press | Anthology | |
| 2017 |
|
Holy Terrors | Tartarus Press | Collection | 11 |
| 2017 |
|
O mestre do oculto | Clock Tower | Collection | 157 |
| January 2017 |
|
The White People and Other Weird Stories | Penguin Books | Collection | |
| 2018 |
|
The Great God Pan and Other Weird Tales | Naxos Audiobooks | Collection | |7 |
| 2018 |
|
The Great God Pan and Other Weird Tales | Naxos Audiobooks | Collection | |5 |
| June 2018 |
|
The Great God Pan | Penguin Books | Collection | |2 |
| June 2018 |
|
The Great God Pan | Penguin Books | Collection | |2 |
| November 2018 |
|
Tales of Horror and the Supernatural | Fantasy and Horror Classics | Collection | |
| January 2022 |
|
The Black Seal and Other Stories | Arcturus Publishing | Collection | 222 |
| June 2022 |
|
The Zinzolin Book of Occult Fiction | Snuggly Books | Anthology | |9 |
| July 2022 |
|
Weird Horror Short Stories | Flame Tree Press | Anthology | 291 |
| March 2023 |
|
La biblioteca di Lovecraft 2 | Edizioni Arcoiris | Anthology | |1 |
| October 2025 | PseudoPod, 30 October 2025 | Escape Artists, Inc. | MAGAZINE |