FLUID MOUNTS. 



flounting in Cells, Etc. 



It is frequently desirable to mount small objects in such a way 

 as to preserve them without crushing or mutilation. In this case 

 the cover glass must be supported in order that it may not come in 

 contact with the preparation. This is accomplished by mounting 

 the object in a cell, which can be made in vaiious ways, depending 

 on the nature of the object to be mounted. If the specimen is very 

 small and is to be preserved in balsam or glycerin jelly, it may suf- 

 fice to place around the object a few pieces of broken cover glass to 

 keep the preparation from being crushed by the cover. Seal as in 

 other mounts. If the object to be mounted is quite large, a deep 

 cell must be made. 



The nature of the material of which the cell should be con- 

 structed must depend on the character of the mounting agent, 

 that is, the material of which the cell is made must not be of a sub- 

 stance in any way acted upon by the mounting fluid. For 

 many mounting media, cells made of shellac are very convenient, 

 and quite durable. 



To make the cells, place the slide on a turn table and when 

 the table is revolving, touch the slide with a small brush dipped in 

 shellac. A ring is the result. After the shellac has dried, another 

 ring should be made on the top of the first. Allow this to dry and 

 repeat the operation until the cell is of the desired depth. Several 

 of these cells should be prepared and kept on hand until they may 

 be needed. Before using, paint over the top a very light coat of 

 thin shellac. The object to be mounted should be placed in the 

 center of the cell, and the latter filled completely with the mounting 



