234 



Modern Microscopy 



Cambridge, and manufactured by Messrs. W. Pye and Co., 

 of the same town. It cuts sections flat, and not in an arc. 



The Del^pine Microtome. — Messrs. E. and J. Beck 

 manufacture a microtome invented by Professor Delepine. 

 This is again a special instrument, as its mission is more 

 particularly the cutting of sections by the freezing process. 

 It is illustrated in Fig. 58. 



Beyond those enumerated, there is no microtome of im- 

 portance manufactured in this country. American micro- 

 tomes are mostly copies of the German instruments modified 

 by certain alterations which may or may not be improve- 

 ments. 



Fig. 59. 



Thoma's Microtome by Jung. — A microtome of great 

 merit, which held undisputed superiority for many years 

 over its rivals, and still is one of the best and most useful 

 instruments, is known as Professor Thoma's, and is made 

 by E. Jung, of Heidelberg. This instrument, which is illus- 

 trated in Fig. 59, is constructed upon the Eivet model, the 

 knife moving in a horizontal plane, and the object in an 

 inclined plane. Fig. 60 presents a diagrammatical view in 

 section of this microtome. D is its base of cast iron which 

 stands upon the work-table on three points ; C is the central 

 support bearing the horizontal plane A on one side and the 

 inclined plane B on the other side. The two V-grooves 

 formed by A C and B C have each three raised sliding 



