ZOOLOGY AND BOTANY, MICROSCOPY ETC. 
895 
plate is pivoted at one end of the microtome and raised by a micrometer 
screw at the other (fig. 108). 
The ball when undamped gives a motion for moving an object in all 
directions till it is in the required position. The milled head which 
raises the object is divided into 100 divisions, and has an index, each 
