XXVIII, 4. Ott: A new Rotary Microtome. 455 



the lower portion of the swinging leaf strikes the back of the knife 

 the upper portion of the swinging leaf clamps the knife at the edge 

 making a most rigid support for the knife. These clamps niay be 

 oriented to any desired angle or moved to and from one anotlier 

 as desired. When close together the knife may be moved along to 

 use practically all of the cutting edge before necessitating reshar- 

 pening. 



The whole of the feeding mechanism is covered, protecting the 

 wearing parts from dust and making a much neater appearing in- 

 strument. When necessary to get to the working parts the hinged 

 cover can be raised and thrown back. Inside of the case receptacles 

 are provided for the knives (K) and object discs {OD). 



The microtome is the result in the first place of careful study 

 of the conditions and requirements met with in the laboratory ; and 

 in the second place of careful experimentation ; and thirdly from a 

 mechanical standpoint to employ such principles and to work out 

 such features as have fully accomplished the desired ends. 



[Eingegangen am 7. November 1911.] 



