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Updated: May 23, 2025
Quite lately P. Lowell has announced that V. M. Slipher, at Flagstaff Observatory, succeeded in 1907 in rendering some plates sensitive far into the red.
Yet absolutely the only proof he gives that the caps are frozen water is the almost frivolous colour-argument above referred to! No Spectroscopic Evidence of Water Vapour. He also informs me that Marchand at the Pic du Midi Observatory was unable to obtain lines of aqueous vapour in the spectrum of Mars; and that in 1905, Slipher, at Mr.
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