CONTRIBUTIONS TO 
THE THEORY OF 
NATURAL SELECTION. 
GY Series of Gasuys. 
BY 
ALFRED RUSSEL WALLACE, 
AUTHOR OF 
(THE MALAY ARCHIPELAGO,” ETC., ETC. 
SECOND EDITION, WITH CORRECTIONS AND ADDITIONS. 
Neto Work: : 
MACMILLAN AND CO. 
1871. 
[The Right of Translation and Reproducti is reserved. ] 
