Chapter 3

THE CLIMATE AND PHYSIOGRAPHY OF MARS, --No permanent water on Mars --Rarely any clouds and no rain --Snow-caps the only source of water --No mountains, hills, or valleys on Mars --Two-thirds of the surface a desert --Water from the snow-caps too scanty to supply the canals --Miss Clerke's views as to the water-supply --Description of some of the chief canals --Mr. Lowell on the purpose of the canals --Remarks on the same --Mr. Lowell on relation of canals to oases and snow-caps --Critical remarks on the same.