The Case of Charles Dexter Ward
"The Case of Charles Dexter Ward" contains the first mention of the Cthulhu Mythos entity Yog-Sothoth, who appears repeatedly as an element in an incantation. Joseph Curwen is the owner of a copy of the "Necronomicon" and there are hints of cult activities in a fishing village that refer obliquely to the events narrated in "The Festival". The story also contains references to the Dream Cycle: Dr. Willett notices the "Sign of Koth" chiselled above a doorway, and remembers his friend Randolph Carter drawing the sign and explaining its powers and meaning.