THi; MICROSCOPICAl, ADVERTISEIR. 



Zeiss Microscopes. 



THE CARL I[IS5 OPTICAL WIRKS III JENA. 



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

 Catalogue of 1891 contains all the latest improvements in Miceoscopic and Photo-Micbo- 

 GEAPHic 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, rilled 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., Netv York, N, T. 



JOSEPH ZENTMAY£R. 



209 South 11th Street, - PHILADELPHIA. 



STUDENTS' MICROSCOPES, $38 to $46, 

 COMPLETE. 



ILLUSTRATED CATALOGUE ON APrLICATION. 



Incorporrtto<l 189a. 



Spencer & Smith Optical Company, 



367-373 Seventh Street, 

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



MANnFArrruicKSi of 



High-Grade Microscopes, Telescopes, and 

 Accessories. 



PROMPT ATTENTION GIVEN ALI. ORDERS. 



Send for our uew cutalugae, just out, giving full dcsoriptiuus aud jjrice lists. 



