ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 



705 



of the slit into the image plane of the Microscope objective A A. Quite 

 at the end of the bench there is a Microscope stand i, with the base- 

 plate Jc and cross- carrier 1. The base-plate is clamped by the screw s, 

 and the cross-carrier by two screws m (only one of which is visible in 



142. 



Fig. 109. 



the figure), which move it micrometrically in two directions _at right 

 angles. The Microscope objective A A for the illumination is fastened 

 to the carrier by a sleeve and moves with it, and thus the beam of light 

 can be centred for the observation Microscope objective D*. When in 



