8i 



MOUNTING AND LABELING. 



Fig. 40, A- 



A 



96 



Jo. 96 /880 



JVeri/e. fiders 

 Cat 



-Part of a cabinet drawer seen from above. In compartment No. 96 

 B is represented a slide lying flat. The label of 



the slide and the number of the compartment 

 are so placed that the number of the compart- 

 ment may be seen through the slide. The seal- 



I ing cement is removed at one place to show 

 that in sealing the cover-glass, the cement is 

 put partly on the cover and partly on the slide 

 (S 168). 



j Fig. 40, B. — This represents a section of the 

 same part of the drawer, (a) Slide resting as in 

 A No. 96. The preparation is seen to be above 

 a groove in the floor of the compartment, (b) 

 One end of the slide is seen to be uplifted by 



I depressing the other into the bevel. 



70 



-"^ 



MOUNTING OBJECTS — EXPERIMENTS. 



l \ 184. Mounting Dry, or in Air (# 170). — Pre- 

 pare a shallow cell and dry it {\ 167). Select a 

 clean cover-glass slightly larger than the cell. 

 Pour upon the cover a drop of a 10 per cent, 

 solution of salicylic acid in 95 percent, alcohol. 

 Let it dry spontaneously. Warm the slide till 

 FlG - 40. the cement ring or cell is somewhat sticky, 



then warm the cover gently and put it on the cell, pressing down all around (g 170). 

 Seal the cover, label and catalog {\\ 179, 181). 



A preparation of mammalian red blood corpuscles may be made very satisfac- 

 torily by spreading a very thin layer of fresh blood on a cover with the end of a 

 slide. After it is dry, warm gently to remove the last traces of moisture and 

 mount precisely as for the crystals. One can get the blood as directed for the Mi- 

 cro-spectroscopic work (# 146). 



\ 185. Mounting in Glycerin Jelly.--For this select some stained and isolated 

 muscular fibers. Arrange them on the middle of a slide, using the centering card, 

 and mount in glycerin jelly as directed in \ 174. Air bubbles are not easily re- 

 moved from glycerin jelly preparations, so care should be taken to avoid them. 



\ 186. Mounting in Balsam by Desiccation (g 176).— Find a fresh fty, or if in 

 winter procure a dead one from a window sill or a spider's web. Carefully remove 

 the fly's wings, being especially careful to keep them the dorsal side up. With a 

 camel's hair brush remove any dirt that may be clinging to them. Place a clean 

 slide on the centering card, then with fine forceps put the two wings within one 

 of the guide rings. Leave one dorsal side up, turn the other ventral side up. 

 Spread some Canada Balsam on the face of the cover-glass and with the fine for- 

 ceps place the cover upon the wings (PI. II, Fig. 14). Probably some air-bubles 

 will appear in the preparation, but if the slide is put in a warm place these will 

 soon disappear. Label, catalog, etc., {I 176, 179, 181).* 



\ 1S7. Mounting in Balsam by Displacement (?2 175, 177). — For this experi- 

 ment select a stained section of an}- organ or tissue, as the skin, or myel (spinal 

 cord), then proceed exactly as described in §§ 175, 177. 



* The Faber's pencils for writing on glass, china, etc., are very convenient for 

 writing temporary labels, etc., on slides and bottles. 



