HOW TO USE THE MICROSCOPE 37 



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. 



