John Russell Fearn & Vargo Statten 
Inner Cosmos [EPUB ebook] 

Another story novelized from the pages of Astounding Stories, telling of the experiments of an alien race who have migrated to the solar system to domicile themselves on Mars. Their experiments result in the death of their leader and lead to the Martians being overwhelmed by an invasion of beings from the microcosm…and, ultimately, to the creation of life on Earth!