APPARATUS 9 



Clamps have been devised for holding safety razor blades for cutting 

 with rotary microtomes (Fig. 4). 



Fig. 2. — A sliding microtome capable of the best paraffin sectioning, and also good for cutting 

 sections of stems, roots, and other things. 



Fig. 3. — Clamp for sliding microtome for holding thin safety razor blades 



Success with safety razor blades depends, to a large extent, upon the 

 blade. Many blades, which are fairly good for shaving, are worthless 

 for microtome cutting, because they are too soft. After the leading 

 domestic firm had refused to furnish blades much harder than those 



