VOL. XI, NO. 476 ' 



AUGUST, 1906 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



. DEXLEE AND L. FKEUND 567 



BOSTON, U. S. A. 

 GINN & COMPANY, PUBLISHERS 

 29 BEACON STREET 



Chicago 



