1/1 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.. |