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 pepe of all ee of animals, for class 
ork o 
or the museum. For pr ce list 
and all ntonio, addres 
GEO. M. GRAY, CURATOR - - M eos HOLL, Mass. 
"EI NG MICROSCOPES 
of every size, style and price, suited 
for all kinds of work. 
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 
Lens Holder for Anatomical Work. 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. 2@> Catalog free. 
Sample copy JOURNAL OF APPLIED MICROSCOPY on request. 
BAUSCH & LOMB OPTICAL co. 
NEW YORK OFFICE HICAGO OFFICE: = 
stn rst and ronda, ROCHE URS N. Y. ste and angen Sw "OS. 
The only machine ever invented which will add | 
eas ates cutus M ole time by the simple touching . 
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S 
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The on: iP machin ever im invented which multiplies T 
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