THE MICROSCOPICAL JOURNAI^ ADVERflSER. 



Zeiss Microscopes. 



THE GAfIL \m OPTICAL WORKS IN JENA. 



These works have no rival in the manufacture of stands and objectives. Their new 

 Cfttalogue of 1891 contains all the latest improvements in Microscopic and Photo-Miobo- 

 GRAPHic Apparatus. As Agent I am enabled to import all their apparatus at the very 

 lowest rates. Orders for Colleges and Institutions filled promptly, duty free. Just out : 

 Carl Zeiss' Catalogue of Optical Measuring Instruments. 



Six new series of Photographic Lenses, called the Zeiss Anastigmats (U. S. Patent 

 No. 435,271;, are the newest production of the Carl Zeiss firm. Their superiority over all 

 others is everywhere recognized in Europe. 



Catalogues forwarded on application. 



F. J. EMMERICH, Sr., Agent, 



74 Murray St., New York, N. Y. 



JOSEPH ZENTMAYER. 



209 South 11th Street, - PHILADELPHIA, 



Si^tolo^idkl ]Vlidi^o^do|)e^, $6g. 



STUDENTS' MICROSCOPES, $38 to $46, 

 COMPLETE. 



ILLUSTRATED CATALOGUE ON APPLICATION. 



Incorporated 1893. 



Spencer & Smith Optical Company, 



367-373 Seventh Street, 

 Buffalo, N. Y., U. S. A. 



^_ MANUFAI'TIJRERS OF 



High-Grade Microscopes, Telescopes, and 

 Accessories. 



PROMPT ATTENTION GIVEN AI^I, ORDERS. 



Send for our new catalogue, just out, giving full debcriptions and price lists. 



