Page:Is Mars habitable - Wallace 1907.djvu/19

 CHAPTER VIII. PAGE


 * The canals the origin of Mr. Lowell's theory—Best explained as natural features—Evaporation difficulty not met by Mr. Lowell—How did Martians live without the canals—Radiation due to scanty atmosphere not taken account of—Three independent proofs of low temperature and uninhabitability of Mars—Conclusion.