

EVOLUTION 



BY 



PATRICK GEDDES 



PROFESSOR OF BOTANY, ST. ANDREWS UNIVERSITY 



AND 



J. ARTHUR THOMSON 



REGIUS PROFESSOR OF NATURAL HISTORY, ABERDEEN 



UNIVERSITY 



Joint Authors of" The Evolution of Sex," etc. 





NEW YORK 

 HENRY HOLT AND COMPANY 



LONDON 

 WILLIAMS AND NORGATE 



