74 MOUNTING AND PREPARATION OF OBJECTS. 



ing or injecting sections intended for photography, 

 and also that only two methods of mounting, namely, 

 in gum and glycerine, and dry, are required for 

 any preparation within the domain of microscopy. 



The secret of successful mounting is cleanliness ; 

 all solutions must be filtered before and after using; 

 specimens, while in them, should be covered with a 

 bell jar ; and all media should be kept in wide mouth- 

 ed bottles, closed by glass caps, not corks or stoppers. 



The most convenient articles for keeping sections 

 in during the staining and cleaning processes, are 

 large ointment pots ; in lieu of these saucers may be 

 used. 



Glass rods should be kept in the bottles, for re- 

 moving small quantities of the media to the slides. 



The thin glass when purchased should be cleaned 

 in dilute nitric acid, and kept for use in small jars 

 containing alcohol. When required one is taken 

 out, dried in an old linen or calico rag, and finally 

 polished with a piece of soft wash-leather ; this may 

 be easily accomplished by folding the leather over it, 

 and placing it when thus covered between the finger 

 and thumb ; a good deal of pressure and polishing 

 can be done in this way without much risk of frac- 

 ture. 



All specimens when mounted must be kept in flat 

 trays in a horizontal position, the trays themselves 

 being placed in a box opening at the side and top 

 to allow of their easy removal. 



