CHAPTER III.
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..