74 MOUNTING AND L 4BELING. 



clean slide, and if no cell is required a centering card is employed to 

 facilitate the centering (PI. V, Fig. 46). 



3. A drop of pure glycerin is put upon the object, or if a cell is used, 

 enough to fill the cell. 



4. In putting on the cover-glass it is grasped with fine forceps and 

 the under side breathed on to slightly moisten it so that the glycerin 

 will adhere, then one edge of the cover is put on the cell or slide and 

 the cover gradually lowered upon the object (PI. II, Fig. 14). The 

 cover is then gently pressed down. If a cell is used, a fresh coat of ce- 

 ment is added before mounting (§ 168 B). 



5. The cover-glass is sealed (§§ 168, 169). 



6. The slide is labeled (§ 179). 



7. The preparation is cataloged and safely stored (§§ 181-1S3). 



§ 173. Order of Procedure in Mounting Objects in' Farrant's 

 Solution. 



A cell is only necessary when the object is of considerable thickness. 

 The object may be considerably thicker than when glycerin is used 

 without requiring a cell. 



1. The centering card is vised (PI. V, Fig. 46), and a small drop 

 of Farrant's solution put in the middle. The suitably prepared ob- 

 ject is then put on the solution in the center and carefully arranged as 

 desired. 



2. A drop of the Farrant's solution is put on the object, or if a cell is 

 used it is filled with the medium. 



3. The cover-glass is grasped with fine forceps, the lower side 

 breathed upon and then it is gradually lowered upon the object (PI. II, 

 Fig. 14), and slightly pressed down. 



4. After the mounting medium has hardened round the edge of the 

 cover-glass the superfluous medium is scraped and wiped away and the 

 cover sealed with shellac (§§ 168, 169). 



5. The slide is labeled (§ 179). 



6. The preparation is cataloged and safely stored (§§ 1S1-183). 



§ 174. Order of Procedure in Mounting Objects in Glycerin 



Jelly. 



1. Unless the object is quite thick no cell is necessary with glycerin 

 jelly. 



2. A slide is gently warmed and placed on the centering card 

 (PI. V, Fig. 46) and a drop of warmed glycerin jelly is put on its cen- 

 ter. The suitably prepared object is then arranged in the center of the 

 slide. 



3. A drop of the warm glycerin jelly is then put on the object, or if a 

 cell is used it is filled with the medium. 



