124 



no. Sealing glycerin mounted specimens. Wipe away 

 the superfluous glycerin as carefully as possible with a moist cloth 

 or a piece of lens paper. Place four minute drops of cement care- 

 fully at the edge of the cover at the four quarters and allow them to 

 harden for half an hour or more ; these will anchor the cover-glass 

 and the preparation may then be placed upon the turn-table and a 

 ring of shellac cement put round the edge while revolving the turn- 

 table. 



ni. Sealing glycerin-jelly mounts. Allow the glycerin- 

 jelly to harden for 12 hours or longer. With a knife scrape away 

 the superfluous jelly and then carefully wipe around the cover-glass 

 with a cloth moistened with water. Place the slide on a turn-table, 

 carefully center the cover-glass, and with a brush seal the edge of 

 the cover by a ring of shellac while revolving the turn-table. A 

 second coating may be given subsequently if needed, after the first 

 coat has dried. 



112. Sealing balsam mounts. This is necessary only 

 with special preparations, and should in any case be done only after 

 the preparations have dried out for several weeks. With a knife 

 scrape off all superfluous balsam from around the cover-glass and 

 wipe it carefully with a cloth moistened with alcohol or benzin (or 

 xylene). Seal as with glycerin-jelly mounts. When the oil im- 

 mersion is to be used often, it is advantageous to seal the prepara- 

 tion with shellac (after it has dried) to facilitate cleaning away the 

 immersion fluid. 



LABELING MICROSCOPIC SLIDES. 



113. Every permanent microscopic preparation should be 

 carefully and neatly labeled in ink, the label being placed upon the 

 right hand end of the slide. The label should furnish at least the 

 following information : 



EXAMPLE. 



(1) The number of the preparation, 



the thickness of the cover- 

 glass and of the section. 



(2) The name, kind, and source of m 



Transection. 

 the preparation. 



No. C. 15. 



S. 



Ileum of Cat. 



(3) The date of the specimen. 



November, 1898. 



