This post begins: Formless, gelantinous, slimy monsters are one of the Pulps’ great creations. Weird Tales had its share, if not all the classics, such as H. P. Lovecraft’s shoggoth in “At the Mountains of Madness” that appeared in Astounding Stories. John W. Campbell’s chameleonic Thing in “Who Goes There?” appeared in Astounding Science Fiction. Lovecraft would be more famous for inspiring The Blob films with “A Colour Out of Space” (Amazing Stories, September 1927), which doesn’t actually have slime in it. The filmmakers changed the weird colour for a meteorite full of pink goo.
If you’d like to read the rest, please check out Monster: From the Pages of Dark Worlds Quarterly.