Cutting Sections, &c. By Brs. Johnsion-Lavis and Vosmaer. 203 



dry it is washed with chloroform, benzole, or turpentine and finally 

 mounted in balsam as an ordinary section. 



The method will strike the reader as a long one, tedious, and open to 

 failure in consequence of the number of different processes involved; 

 but by preparing a number at once much time is saved, and one failure 

 prevents our exposing ourselves to a repetition by teaching us in what 

 way we have erred. At any rate the whole goes quicker than Yon 

 Koch's method and does not injure the object as in the too rapid method 

 of putting the object into boiling balsam. We have succeeded in 

 making large sections of the very hardest sponges, showing most of the 

 cells as little altered as in paraffin-prepared objects, and in one case the 

 preparation includes a section through a gasteropod shell. It is possible 

 to make sections of an unlimited size, a great advantage for studying 

 the relationship between the canal-system and the skeleton. 



We have still to describe the little oven constructed by the second- 



FiG. 34. 



named author. This oven (fig. 34) consists of a brass box the inner 

 walls of which are lined by asbestos cardboard, whilst the bottom is 



p 2 



