HOW TO USE THE MICROSCOPE ot 
Microtome knives should be honed as often as is necessary 
to insure a proper cutting edge. After cutting objects, the 
knives should be removed, cleaned, and oiled. 
It should be kept clearly in mind that special knives are 
required for cutting collodion, paraffin, and frozen and woody 
sections. The cutting edges of the different knives vary con- 
siderably, as is shown in the preceding cuts. 
