The Evolution of Worlds

Transcriber’s Notes:
The cover image was created by the transcriber and is placed in the public domain.
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Saturn—photographed at the Lowell Observatory by Mr. E. C. Slipher. September, 1909.
THE EVOLUTION OF WORLDS
PERCIVAL LOWELL, A.B., LL.D.
AUTHOR OF “MARS AND ITS CANALS,” “MARS AS THE ABODE OF LIFE,” ETC.
DIRECTOR OF THE OBSERVATORY AT FLAGSTAFF, ARIZONA; NON-RESIDENT PROFESSOR OF ASTRONOMY AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY; FELLOW OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES; MEMBRE DE LA SOCIÉTÉ ASTRONOMIQUE DE FRANCE; MEMBER OF THE ASTRONOMICAL AND ASTROPHYSICAL SOCIETY OF AMERICA; MITGLIED DER ASTRONOMISCHE GESELLSCHAFT; MEMBRE DE LA SOCIÉTÉ BELGE D’ASTRONOMIE; HONORARY MEMBER OF THE SOCIEDAD ASTRONOMICA DE MEXICO; JANSSEN MEDALLIST OF THE SOCIÉTÉ ASTRONOMIQUE DE FRANCE, 1904, FOR RESEARCHES ON MARS; MEDALLIST OF THE SOCIEDAD ASTRONOMICA DE MEXICO FOR STUDIES ON MARS, 1908
ILLUSTRATED