150 MOUNTING AND LABELING. \CH. VII. 



2. A suitably prepared object (§ 235) is placed on the center of a clean 

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

 the centering (Fig. 126.) 



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 (Fig. 123). The cover 

 is then gently pressed down. If a cell is used, a fresh coat of cement 

 is added before mounting (§ 234.) 



oc 



Fig. 127. Slide and cover glass showing method of anch- 

 oring a cover-glass with a glycerin preparation when no 

 cell is used. A cover-glass so anchored is not liable to 

 move when the cover is being sealed (j! 238). 



Fig. 128. Glass slide with cover-glass, a drop of reagent 

 and a bit of absorbent paper to show method of irriga- 

 tion ({S 247, 248). 



5. The cover-glass is sealed {% 234). 



6. The slide is labeled (§ 292). 



y. The preparation is cataloged and safely stored (§ 293, 296). 

 § 237. 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 (Fig. 

 126) and a drop of warmed glycerin jelly is put on its center. 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. 



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

 breathed on and then gradually lowered upon the object (Fig. 123), 

 and gently pressed down. 



5. After mounting, the preparation is left flat in some cool place till 

 the glycerin jelly sets, then the superfluous amount is scraped and 

 wiped away and the cover-glass sealed with shellac ( § 234, 248). 



6. The slide is labeled (§ 292). 



7. The preparation is cataloged and safely stored (§ 296). 



$5 238. Sealing the Cover-Glass when no Cell is used. — (A) 

 For glycerin mounted specimens. The superfluous glycerin is wiped 



