CARNEGIE INSTITUTION OF WASHINGTON 

 PUBLICATION No. 122 



PAPERS OF THE STATION FOR EXPERIMENTAL EVOLUTION No. 15 



Copies of this Book 

 were first iss 



JUN291910 



THE CORN M \N I'ltl NTI N<; COMPANY, 



( \ i: i isi. I-:. i'i:\ \>i i.\ \ \ I A. 



