Though H. P. Lovecraft is famed mostly for the influential body of short fiction he left behind, he was also one of the most prolific correspondents of his time, the author of more than 100,000 letters. Undiscovered and unpublished until now, The Natural Dissolution of Fleeting-Improvised-Men is the last letter that Lovecraft wrote, finishing it just days before his death on March 15, 1937. This edition features extensive notes from the editor, Gabriel Blackwell.