Chapter II
Reading edition
MR. LOWELL'S DISCOVERIES AND THEORIES, —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.