Notes. 
274 
The blade is cut in two, and each half has a central hole and can be trimmed to 
form a washer, and placed in the position indicated in Fig. 1. 
The resulting composite microtome blade can be at once inserted in the micro- 
tome in the ordinary way. The arrangement as described is adapted to the Minot- 
Zimmermann microtome, but could be adapted with slight variations to many others. 
It cuts sections as thin as 2 ju with success, and gives results equal to those obtained 
with any blade. 
