I wonder what kind of buzz this serial generated in the letters column. Well, there is this --
"Why in the name of science fiction did you ever print such a story as 'At the Mountains of Madness' by Lovecraft? Are you in such dire straits that you must print this kind of drivel?... If such stories as this -- of two people scaring themselves half to death by looking at the carvings in some ancient ruins, and being chased by something that even the author can't describe, and full of mutterings about nameless horrors, such as windowless solids with five dimensions, Yog-Sothoth, etc. -- are what is to constitute the future yarns of Astounding Stories, then heaven help the cause of science-fiction." -- Letters Column, Astounding Stories, June 1936 as quoted in the introduction to Tales of the Cthulhu Mythos by H.P. Lovecraft and Divers Hands. [taken from Web]