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 



1. 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). 



11 



Wim 



'.'//;//, I'L 



m 



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, 

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

 jelly. 



