EVOLUTION 



BY 



PATRICK GEDDES 



11 



PROFESSOR OF BOTANY, ST. ANDREWS UNIVERSITY 

 ^ AND 



jl ARTHUR THOMSON 



REGIUS PROFESSOR OF NATURAL HISTORY, ABERDEEN 



UNIVERSITY 



Joint Authors of " The E<volutton of SeXy^'' etc. 



NEW YORK 

 HENRY HOLT AND COMPANY 



LONDON 

 WILLIAMS AND NORGATE 



