54 MOUNTING AND PREPARATION OF OBJECTS. 



CHAPTER IY. 



MOUNTING AND PREPARATION OF OBJECTS. 



THE present chapter might be considered superfluous 

 but for the fact that objects designed for Photo- 

 micrography require different treatment from those 

 intended for ordinary microscopic examination. In 

 addition to this we wish to impart to others the little 

 knowledge we have obtained, and thus prevent the 

 disappointment and loss of time, consequent on a 

 dearly bought experience. 



The usual method of mounting microscopic speci- 

 mens is, having previously prepared them by some of 

 the ways mentioned farther on, to place them on 

 plate-glass slips three inches long and one wide, then 

 after the addition of a small quantity of a suitable 

 preservative medium, to cover them with a square or 

 circle of very thin glass, which is fastened in posi- 

 tion either by the medium itself, or by a ring of 

 cement painted round its edge. 



The disadvantages of this method will be apparent, 

 when the advantages of the one now advocated are 

 stated. Its universal adoption is not expected, be- 

 cause the old plan gives greater scope for artistic 

 display, and the manufacture of a kind of article 

 whose external appearance makes it more saleable. 



The method is as follows. After the usual pre- 



