Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation

by Alfred Russel Wallace

CHAPTER IV.

IS ANIMAL LIFE POSSIBLE ON MARS?
—Water and air essential for animal life
—Atmosphere of Mars assumed to be like ours
—Blue tint near melting snow the only evidence
of water
—Fallacy of this argument
—Dr. Johnstone Stoney's proof that water-vapour
cannot exist on Mars
—Spectroscope gives no evidence of water.