USEFUL MICROSCOPE ACCESSORIES 



119 



angles and elevations. The rack and pinion serves as a fine 

 adjustment or to facilitate the examination of the surfaces of 

 irregular objects. 



FIG. 62. Lens Holder. 



Reagent Containers. Dry reagents for microchemical analy- 

 sis are conveniently kept in tiny glass stoppered vials in a 

 block of wood (Fig. 63), the stoppers of which are numbered or 

 lettered and the contents recorded upon a small chart which may 



FIG. 63. Reagent Set for Microchemical Analysis. 



be placed under the glass plate on the work table. A transport- 

 able set of reagents is shown in Fig. 64, modeled after the reagent 

 box designed by Behrens, 1 differing from that of Behrens in only 

 two particulars; in having upright stoppers in the vials instead 



1 Anleitung z. Mikrochem. Anal., Leipzig, 1899, P- 2 9- 



