PEE 
AMERICAN NATURALIST 
A MONTHLY JOURNAL DEVOTED TO THE 
NATURAL SCIENCES IN THEIR 
WIDEST SENSE 
REPRING 
FROM 
Vou. XX XV, No. 412. APRIL, Igor 
a4) 
BOSTON 255 qo5 
GINN & COMPANY | SS brig, mo) 
The Atheneum Press —— 
IQOI 
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