STAINS, REAGENTS, &c. 49 



Placfe the balsam in an evaporating pan and gently heat over a compound 

 bunsen flame, stirring frequently, until when a drop of the hot balsam is 

 allowed to fall into a vessel of cold water, it at once sets brittle. The balsam 

 should now be allowed to cool, but not to set hard, when it may be thinned down 

 to the required consistency with fwre rectified benzol, or with pure xylol as 

 required. Filter for use. 



Gum Dammar. 



Make a saturated solution of gum dammar in rectified benzol, and filter 

 for use. 



Glycekine Jelly. 



Finest French gelatine 1 oz. 



Water 6 ozs. 



Pure glycerine, by weight 7 ozs. 



Soak the gelatine in the water for two hours ; then add the glycerine, warm 

 until dissolved, and then add 1% of pure carbolic acid as a preservative, and 

 filter for use with the aid of a hot-water jacket. 



Faerant's Medium. 



Arsenious acid 1 gram. 



Water 200 cc. 



Gum acacia 130 grams. 



Pure glycerine 100 cc. 



Dissolve the acid and the gum in the water by heat ; then add the glycerine, 

 and filter for use. 



Glycerated Water. 



Distilled water 225 cc. 



Pure glycerine 75 cc. 



Corrosive sublimate 1 gram. 



Filter for use. 



