MICROSCOPES OF AMERICAN MAKE. 



705 



ment, with all the accessories and full sets of object-glasses, will 

 approach $350. (Fig. 426.) 



Fia. 426. 



Spencer's Trunnion Microscope. 



The second-class instruments, complete as to object-glasses and 

 accessories, but mounted less expensively, cost from $200 to $250. 



A very efficient microscope, is one known as the "Pritchard 

 form:" this instrument has been somewhat modified by Mr. 

 Spencer, and where a less expensive instrument than either of 

 the others is desired, this one will be found a good working in- 

 strument, and available for all purposes of anatomical study. The 

 cost of this form, with object-glasses as high as the |th, with the 

 usual accessories, is from $125 to $150. 



Mr. Spencer also makes some simpler forms of instruments, 



45 



