Homer Eon Flint

Mercurian n. 2	1919 H. E. Flint Lord of Death in Famous Fantastic Mysteries (1939) Dec. i. v. 57/2 It would be only begging the question to doubt the genuineness of the thing. And if, understanding the language, one were to hear the original as it fell, word for word from the iron mouth of Strokor the Great (in the Mercurian language, strok means iron, or heart)—hearing that, one would believe; none could doubt, nor would. [Ibid. ii. ii. 61/1] I judge that his vision took place on Jeos (the Mercurian word for earth), a world much larger than ours, according to my calculations, and doubtless having enough air to permit very light creatures to move about in it.
planeteer n.	1918 H. E. Flint The Planeteer in All-Story Weekly 9 Mar. (title) The Planeteer.