ONE DOLLAR 
EACH IS OFFERED for one copy of THE 
AMERICAN NATURALIST for December, 1888, 
and for December, 1891. 
LOCKBOX 2, WILLIAMSTOWN, MASS. 
MARINE BIOLOGICAL SUPPLY DEPARTMENT 
Dune material of all types of animals, for class 
ork or for the museum. For price list 
me all information, address 
GEO. M. GRAY, CURATOR - - WOODS HOLL, Mass. 
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Sample copy JOURNAL OF APPLIED MICROSCOPY on request. 
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