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device consists essentially of a stout blade split lengthwise in a plane 

 passing through the cutting edge, and having the two parts hinged to- 

 gether at the side away fram the cutting edge. By means of a setscrew 

 the two parts of the blade may be firmly pressed together and held so. 

 The thin blade, which is to be used as the actual cutting edge, is placed 

 in position between the two parts of the supporting blade with its edge 

 slightly projecting, and is firmly clamped there by tightening the set- 

 screw. The instrument is then ready for use. For the details of struc- 

 ture the reader is referred to the accompanying drawing. 



The device is adapted for microtomes, either of the Minot form or the 

 Bausch & Lomb sliding form. In the author's hands it has cut as good 

 sections with either instrument as he has ever gotten with the best knives 

 of the Old form. The capacity of the knife is limited by the shortness of 

 the blade, but for practically all student work it will be found ample. 

 The instrument possesses the great advantage that each student can pro- 

 vide his own cutting edge, the cost being trifling, and thus the confusion 

 of having a number using the same knife is avoided. 



