CHAPTER V. 



ON MOUNTING AND PRESERVING OBJECTS FOR 

 EXAMINATION. 



IF a low power is used, and the object be one not necessary 

 to be preserved, it can be well seen if placed in the forceps or 

 on a slip of glass, but if it be desired to keep it for future 

 examination, some method of preserving it from decay, dust, 

 &c., must be resorted to ; and the method will vary according 

 to the nature of the object. 



TRANSPARENT OBJECTS. 



Transparent objects are mounted on slips of glass, the size 

 of which, as adopted by the Microscopic Society of London, is 

 3 inches by 1 inch, or 8 inches by 1J inches. The French 

 opticians, however, prepare many of their slides 2| inches by 

 gths of an inch, and this size is most frequently imported into 

 the United States ; indeed, a larger size is unsuitable for many 

 of the French instruments, although to be preferred on other 

 accounts. 



There are three methods of mounting transparent objects. 

 1st, in the dry way in which the object is simply placed 

 upon the slip of glass, and covered with a thin glass cover, 

 cemented by its edges to the under piece, with sealing-wax 

 varnish, &c. 



