MICROSCOPE AND OPTICAL APPARATUS II 



universally known as the foregoing are the 

 student's microscopes and outfits of the Spencer 

 Lens Company, Buffalo, New York, but which 

 are destined to at least rival the best of them 

 in popularity as they become more generally 

 known. The name of Spencer indeed ante- 

 dates all of these. The first American lenses 

 (made by the founder of the present house) 

 bore an extended reputation early in the sec- 

 ond half of the last century. Having been 

 furnished, through the courtesy of its makers, 

 with an opportunity to examine and practically 

 test one of these instruments, I can do no less 

 than give expression to the great satisfaction 

 afforded me thereby. In design and general 

 appearance it closely resembles the other 

 microscopes of its class already mentioned. 

 The workmanship throughout is first-class; 

 the fine adjustment in particular being ex- 

 tremely delicate in action with great solidity 

 of construction. The compound body is of 

 greater diameter than other stands of its class, 

 thus allowing a larger cone of light to pass 

 than is possible with the narrow German 

 tubes, a decided advantage in photo-micro- 

 graphy, and particularly so when the objec- 

 tive is used alone for projection without an 

 eyepiece. The draw-tube is then to be re- 



