THE 

 WONDER OF LIFE 



B 7 



J. ARTHUR THOMSON, M.A., LL.D 



Regius Professor of Natural History in the University of Aberdeen. 



Author of 'The Biology of the Seasons,' 'Darwinism and 



Human Life,' 'Heredity,' 'The Study of Animal 



Life,' 'Introduction to Science,' etc., etc 



NEW YORK 



HENRY HOLT AND COMPANY 



LONDON: ANDREW MELROSE LTD 



