64 



THE MICROSCOPIST. 



slide, the intervening space may be filled with paper, paste- 

 board, &c., in which a hole has been cut. Such intervening 

 substance is very useful to prevent pressure upon the object. 

 If desirable, the name of the specimen, &c., may be written on 

 this paper, especially if the cover and slide be equal in size. 



MOUNTING OPAQUE OBJECTS. 



These must necessarily be viewed by light reflected in some 

 manner from their surface. Some transparent objects, however, 

 may be viewed as opaque ones by using the dark well or stop, 

 e, Fig. 16. When mounted with this design they may be 

 placed on the slip of glass with a little gum-water, and sur- 

 rounded with a rim of card, paper, &c., sufficiently thick to 

 form a proper cell, which may be covered with thin glass. 

 Sometimes opaque objects are fixed on a round piece of black 

 paper stuck upon a slide. 



Fig. 21. 



a, Fig. 21, represents a disc of leather, felt, or other suitable 

 material, about three-eighths or half an inch in diameter, with a 

 pin passing through it. "The side for holding the object is to 



