138 



IMBEDDING METHODS. 



A' 



T 



c- 



FIG. 2. 



D 



FlG. 1. 



paper several times round it so as to make a projecting collar, 

 and stick a pin through the bottom of the paper into the cork. 

 For work with fluid masses, such as celloidin, the cork may be 

 leaded at the bottom to prevent it from floating, when the whole 

 is thrown into spirit or other liquid for hardening (Fig. 2). 

 " In Professor Leuckhart's laboratory are used boxes made 

 of two pieces of type-metal (Fig. 3). 

 Each of these pieces has the form of a 

 carpenter's "square" with the end of 

 the shorter arm triangularly enlarged 

 outwards. The box is constructed by 

 placing the two pieces together on a plate 

 of glass which has been wetted with 

 glycerin and gently warmed. The area 

 of the box will evidently vary according 

 to the position given to the pieces, but 

 the height can be varied only by using 

 different sets of pieces. In such a box 

 the paraffin may be kept in a liquid 

 state by warming now and then over a 

 FIG. 3. E spirit-lamp, and small objects be placed 



