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

CHAPTER I.

Chapter 169 wordsPublic domain

EARLY OBSERVERS OF MARS, --Mars the only planet the surface of which is distinctly visible --Early observation of the snow-caps and seas --The 'canals' seen by Schiaparelli in 1877 --Double canals first seen in 1881 --Round spots at intersection of canals seen by Pickering in 1892 --Confirmed by Lowell in 1894 --Changes of colour seen in 1892 and 1894 --Existence of seas doubted by Pickering and Barnard in 1894.