127 



water-bath until the gelatin melts, then add the glycerine 

 while stirring with a clean glass rod, and finally add the 

 carbolic acid. Filter through a hot flannel. 



The gum glycerine may be prepared according to Far- 

 rant's formula : 



Glycerine, . . . . . 50 c. c. 



Water, 50 c. c. 



Gum Arabic (powder), ... 50 grms. 



Arsenious acid, .... 1 grm. 



Dissolve the arsenious acid in the water. Place the 

 gum arabic in a glass mortar and mix it with the water, 

 then add the glycerine. Filter through a wet filter paper 

 or through fine muslin. 



