THE RIDDLE OF MARS THE PLANET.
The Biddle of Mars the Planet. By 0. E. Housden. (Longmana and Co. Be. 6d. net.)—The author of this striking essay starts from the observations which have led Mr. Lowell to infer the existence of intelligent living creatures in Mara, and works out the conditions under which artificial irrigation would account for the seasonal changes visible on the surface of that planet. His suggestion, that water is probably trans- mitted along the Martian canals by being pumped through pipes under pressure, has been accepted by Mr. Lowell. Mr. Housden's arguments will be of great interest to all who wish to believe in the plurality of worlds, and to understand the "great and ceaseless activity" which the dwellers in Mars must put forth in order to keep themselves alive in their chilly and rainless abode.
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