326 



MOUNTING MICROSCOPIC OBJECTS 



[Ch. X 



For glycerin jelly no cell is necessary unless the object has a con- 

 siderable thickness. 



§ 506. Order of procedure in mounting objects in glycerin — 



i . A cell must be prepared on the slide if the object is of considerable 

 thickness (§ 503). 



2. A suitably prepared object is placed on the center of a clean 

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

 the centering (fig. 192). 



Fig. 192. Guide Card to Aid in Mounting Objects Neatly. 



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

 used, enough to fill the cell and a little more. 



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

 the underside 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. The cover is then gently 

 pressed down. If a cell is used, a fresh coat of cement is added before 

 mounting. 



5. The cover-glass is sealed. 



6. The slide is labeled. 



7. The preparation is catalogued and safely stored. 



§ 507. Order of procedure in mounting objects in glycerin jelly. 

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

 jelly. 



