LABORATORY MICROSCOPES 



[CJL II 



PATENT APPLIED FOR 



FIG. 71. The new cone movement, fine adjustment for the Photo-Micrographic 

 and the Nos. 20 and 35 Microscopes of the Spencer Lens Co. See the figures of those 

 microscopes pp. 82-87. 



FIG. 71 a. Capped balsam bottle of WhitalL Tatum & Co. This is far more 

 satisfactory than the small spirit lamp figured on p. 172. 



