[he American Naturalist. 
ASSOCIATE EDITORS: 
L a ALLEN, PH.D., American Museum of Natural History, New York. 
E. A. ANDREWS, PH.D., Johns Hopkins University, Baltimore. 
WILLIAM S. BAY LEY, PH.D., Colby University, Waterville. 
CHARLES E. BEECHER, PH.D, Yale University, New Haven. 
DOUGLAS H. CAMPBELL, PH.D., Stanford University. 
( aee SB, Cornell University, Ithaca. 
ALIA , M.E., Harvard a Camb rides 
ALES HR EE MD, New York Ci 
Eoi LL.D., Stanford Univer. 
CHARLES A. KOFOID, Pu.D., Univers ed of Mlinois, Urbana. 
,EDHAM, PH Dra ke Forest Univ 
OLD E. ORTMANN, PH.D., Princeton a Uni toe rsity. 
. PENHALLOW, S.B., F.R.M.S., McGill n Montreal. i 
M. RICHARDS, S.D., Columbia University, Ne 
: RITTER, dus University of California, Blei. 
I Rl SSELL, PH.D., Harvard University, Cam 
SRAEL. € RUSSELL, LLD., University T Meer Ann Arbor. 
ERWIN F. SMITH, S.D., U. S. Department of Agriculture, Washi 
