IMBEDDING METHODS. 91 



In any of these cases the material used for imbedding is 

 technically termed an " imbedding mass }: Einbettungsmasse 

 masse d'inclusion. Imbedding methods are spoken of by 

 French writers as methodes d'inclusion, or methodes d'enrob- 

 age. 



As before stated, the method most generally employed,, 

 and the one which may be considered the normal anatomical 

 method, is the paraffin method. 



126. Imbedding Manipulations. Imbedding in a melted 

 mass, such as paraffin, is performed in one of the following 

 ways. A little tray or box or thimble is made out of paper, 

 some melted mass is poured into it ; at the moment when 

 the mass has cooled so far as to have a consistency that will 

 not allow the object to sink to the bottom, the object is 

 placed on its surface, and more melted mass poured on until 

 the object is covered by it. Or the paper tray being placed 

 on cork, the object may be fixed in position in it whilst 

 empty by means of pins and the tray filled with melted 

 mass at one pour. The pins are removed when the mass is 

 cold. 



In either case, when the mass is cold the paper is removed 

 from it before cutting. 



To make paper trays, proceed as follows. Take a piece 

 of stout paper or thin cardboard, of the shape of the 

 annexed figure (Fig. 1) ; thin (foreign) post-cards do very 

 well indeed. Fold it along the lines a a and b b', then along 

 c c and d d' , taking care to fold always the same way. 

 Then make the folds A A f , B B', C C', D I)', still folding the 

 same way. To do this you apply A c against A a, and 

 pinch out the line ^4 A', and so on for the remaining angles. 

 This done, you have an imperfect tray with dogs' ears at 

 the angles. To finish it, turn the dogs' ears round against 

 the ends of the box, turn down outside the projecting flaps 

 that remain, and pinch them down. A well-made post-card 

 tray will last through several imbeddings, and will generally 

 work better after having been used than when new. 



Another method of folding the paper (MAYER) is described 

 in the Grundziige, p. 72. 



To make paper thimbles, take a good cork, twist a strip of 

 paper several times round it so as to make a projecting 



