An interesting post on Don Herron’s blog, where he writes about new additions to the A Look Behind the Derleth Mythos eBook by John D. Haefele. In this post, he calls Haefele “the reigning expert on the history of the Cthulhu Mythos”.
From the post:
While all the new stuff is very cool, this insert is by far my favorite — if you have the trade paperback, thumb to page 55. Between the second and third paragraphs, following “notice one way or the other).” and ahead of “To be sure….” you now should read:
Joshi repeats all of this in his I Am Providence biography of Lovecraft, stating bluntly: “The term ‘Cthulhu Mythos’ was invented by August Derleth after Lovecraft’s death; of this there is no question.”
But there is a question.
Though the precise term, Cthulhu Mythos, capitalized, is never used formally by HPL, during his most crucial and creative Mythos phase, merely months after he completed At the Mountains of Madness, we find him writing: “There are so many ideas to write out, & so little time to write them in! Cthulhu & his myth-cycle are purely fictitious, & of my own invention” (HPL to Barlow: 13 July 1931).
Clearly, at least in this passage, HPL is referring to his Cthulhu myth-cycle!
Thus Adds Haefele!