ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



259 



most effective use of a dissecting lens or simple Microscope in the 

 field or when travelling. 



Fig. 42 



The lens, stage, and mirror are each carried by a bar sliding on 

 the upright stem which screws into the circular foot. The bars can be 



Fig. 43. 



adjusted to any height and secured by the screws, of which the milled 

 heads are shown on the right of Fig. 42. When detached the instru- 



s 2 



