cbebe 
AMERICAN NATURALIST 
A MONTHLY JOURNALS DEVOTED! TO THI 
NATURAL SCIENCES IN THEIR 
WIDEST SENSE 
Ree REN 
VoL. XXXVII, No. 437. May, 1903 
BOSTON 
GINN & COMPANY, PuBLisHERS 
The Athenzum Press 
Sho) 
