THE 



EVOLUTION THEORY 



BY 



1 AUGUST WEISMANN 



PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF FREIBURG IN B^EISGAU 



TRANSLATED ^VITH THE AUTHOR'S CO-OPERATION 



BY 



J. ARTHUR THOMSON 



REGIUS PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF ABERDEEN 



AND 



MARGARET R. THOMSON 



. ILLUSTRATED 



IN TWO VOLUMES 

 VOL. I 



LONDON 

 EDWARD ARNOLD 



41 & 43 MADDOX STREET, BOND STREET, W. 



1904 



// rights reserved 



