TO COLLECTORS 
I have a few fine, perfect specimens of Argonauta 
Argo (paper Nautilus), about 2% inches, at $1.00 each. 
Also a large number of rare, scarce shells. 
List submitted on application. 
J. F. POWELL, Waukegan, Ill. 
MARINE BIOLOGICAL SUPPLY DEPARTMENT 
Preserved material of all types of piece a class 
work or for the museum. For pric 
and all information, elia 
GEO. M. GRAY, CURATOR - - WOODS HOLL, MASS. 
d NG MICROSCOPES 
of every size, style and gen. suited 
for all kinds of 
A new series of lenses 
for dissecting work have 
recently been perfected by 
us which have unusually 
long working distance and © 
large flat field. These 
lenses are offered at 
prices less than any lenses of equal quality heretofore 
in use. The new Dissecting Stands are all nickeled 
metal with glass stage. 1” Catalog free. 
Sample copy JOURNAL OF APPLIED MICROSCOPY on request. 
.. BAUSCH & LOMB OPTICAL CO; 
30th Street and Bradner, ROCHESTER, NY. eee Vet. se 
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uiri udi chi a ver invented which multiplies 
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52 to 56 Illinois Street, - . + + * * 7 i eere e = 
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