Lovecraft's writings in the realm of literary criticism are unfailingly acute and cover a surprisingly wide range. Besides his authoritative early essay on "The Literature of Rome" (1918), other works condemn free verse and simple spelling, and devote attention to neglected poets. Discovering weird fiction as his chosen field, he produced such scintillating essays as "Lord Dunsany and His Work" (1922) and "Supernatural Horror in Literature" (1927), along with essays on Frank Belknap Long and Clark Ashton Smith. Late in life Lovecraft codified his grasp of weird literature by writing such trenchant pieces as "Notes on Writing Weird Fiction" (1933) and "Some Notes on Interplanetary Fiction" (1934). One of his last writings, "Suggestions for a Reading Guide" (1936), is a comprehensive discussion of world literature.

H. P. Lovecraft has belatedly received world renown as the twentieth century’s premier author of supernatural fiction; but during his lifetime he wrote far more essays than stories. This edition gathers Lovecraft’s complete nonfictional output for the first time, arranged in broad thematic groupings. S. T. Joshi, the world's leading authority on Lovecraft, exhaustively annotates all texts, also providing critical and bibliographical notes.