EVOLUTION 



BY 



PATRICK GEDDES 



PROFESSOR OF BOTANY, ST. ANDREWS UNIVERSITY 



J. ARTHUR THOMSON 



JIUS PROFESSOR OF NATURAL HISTORY, ABERD 

 UNIVERSITY 



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



NEW YORK 

 HENRY HOLT AND COMPANY 



LONDON 

 WILLIAMS AND NORGATE 



