248 Modern Microscopy 



aid of a system of cogs to raise the object 1 /* at a time, or 

 even to fractional parts of that measurement. 



A microtome is illustrated in Fig. 66 upon the same 

 model, made expressly for cutting very thin sections, from 

 1 p or under up to 15 /* or 20 /*. The movement of the knife 

 is by means of a handle seen to the right of the illustration. 



In placing the merits of several microtomes before the 

 reader, it must not be supposed that instruments by makers 

 not herein mentioned are not worthy of consideration. We 

 have simply given the student an insight into the con- 

 struction of various instruments by a few well-known 

 manufacturers. From a study of these pages the student 

 will be able to select an instrument to meet his personal 

 requirements. We might add that a second-hand micro- 

 tome should be thoroughly tested before the purchase is 

 concluded, as in careless hands a good instrument may 

 have been easily ruined beyond ordinary repair. 



Addresses of foreign microtome-makers : 



C. Keichert, 24, Bennogasse, Vienna. 



Aug. Becker, Mechaniker, Gottingen, Germany. 



M. Schanze, 51, Briiderstrasse, Leipzig. 



E. Zimmermann, 21, Emilienstrasse, Leipzig. 



J. W. Giltay, Delft, Holland. 



K. Jung, 12, Landhausstrasse, Heidelberg. 



E. Leitz, Wetzlar. 

 For knives and other instruments : 



W. Walb, 5, Haupstrasse, Heidelberg. 



