-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.

-Observatory at Flagstaff, Arizona -Illustrated book on his observations of Mars -Volume on Mars and its canals, 1906 -Non-natural features -The canals as irrigation works of an intelligent race -A challenge to the thinking world -The canals as described and mapped by Mr. Lowell -The double canals -Dimensions of the canals -They cross the supposed seas -Circular black spots termed oases -An interesting volume.

-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.