LIST OF REAGENTS 433 



III. CLEARING EBAGENTS, 



(i.e. REAGENTS FOR REMOVING ALCOHOL OR PARAFFIN, AND 

 RENDERING THE OBJECT PERMEABLE BY BALSAM). 



OIL OF CLOVES. 



TJse. — To remove alcohol from an object before mounting it in 

 balsam. The object must be left in the oil till it becomes 

 transparent : if left too long the object may become 

 brittle. 



TUEPENTINE. 



TJse. — To remove paraffin from sections (see Introduction, 

 p. xxx). 



<IBEASOTE AND TUBFENTIITE. 



Prepa/raUon. — Mix 100 c.o. creasote with 400 c.c. turpentine : 



allow to stand tiU clear. 

 TJse. — Same as turpentine, but must not be used for sections 



cemented down with shellac. 



IV. MOUNTING MEDIA. 



SALT SOLUTION, -75 per cent. 



Prepa/ration. — Dissolve 7"5 grms. common salt in 1 litre water. 

 TJse. — Living or fresh tissues are usually examined in it. 



GtLYCERIS. — Used either pure, or diluted with an equal bulk of 

 water. 

 TJse. — For moiiutiag microscopical objects. 



GLYCEBIN JELLY. 



Prepa/raUon. — Soak gelatin in water till soft : pour off excess 

 of water : melt, and while still fluid but cool add one- 

 eighth of its bulk of white of egg : mix thoroughly : boil : 

 strain through flannel : to strained fluid while still hot add 

 half its volume of a mixture of equal parts of glycerin and 

 camphor water. 



