Humphreys wrote in multiple periodicals including
The Art Amateur,
Scribner's Sons, ''
Harper's Bazaar, Harper's Weekly, The Evening Sun, and The Chicago Inter-Ocean. In 1885, she co-authored, using the pen name Elinor Gray, Later it was revealed that Somerville was the nom-de-plume of Humphreys. Humphreys went on to publish a sequel, Racer of Illinois'', in 1902. Her final book,
Missionary Explorers Among the American Indians, was included as a volume in Scribner's in 1913. The article was devoted to the lives of six American missionaries:
John Eliot,
Samson Occum,
David Brainerd,
Marcus Whitman, Stephen Riggs and
John Lewis Dyer. ==Selected publications==