Too Long; Didn't Read
The Message from Polter: Beyond the Vanishing Point, by Astounding Stories of Super-Science March 1931, by HackerNoon’s Book Blog Post series. Chapter V: "Glora! Alan, where are you?" Chapter VI: "The giant came lunging up. He was far larger than before" Chapter VII: "We were unhurt, crouching back from the avalanche. The giant's mangled body was still expanding; shoving at the litter of loose rocks"