ZOOLOGY AND BOTANY, MIOEOSCOPY, ETC. 



809 



densing lens for opaque illumination, a mirror "^th tkree arms, joined 

 by ball-and-socket movements, is attached to the limb. The ring 

 which carries the lamp can be variously adjusted on the standard, to 

 suit the convenience of observation. 



Pocket Microscope. — Figs. 169 and 170 show a compact form of 

 compound Microscope (of anonymous French origin) which may be 

 commended for its portability. 



Fm. 169, 



The base is a substantial metal tablet upon which the instrument 

 is screwed (Fig. 169). A cradle joint just above the base permits 

 inclination, and in all positions the Microscope is quite steady. The 

 coarse adjustment is effected by sliding the tube and the fine adjust- 



