We might indeed have been the wraiths of the departed dead upon the dead sea of that dying planet for all the sound or sign we made in passing.
1912 February–July, Edgar Rice Burroughs, “Under the Moons of Mars”, in The All-Story, New York, N.Y.: Frank A. Munsey Co.; republished as “Sola Tells Me Her Story”, in A Princess of Mars, Chicago, Ill.: A[lexander] C[aldwell] McClurg & Co., 1917 October, pages 159–160