FOL'S METAGELATIN VEHICLE. 231 



tion of injecting with the ordinary gelatin masses is greatly 

 complicated by the necessity of injecting them warm. Fox 

 proposes to employ metagelatin instead of gelatin. 



If a slight proportion of ammonia be added to a solution of 

 gelatin, and the solution be heated for several hours, the 

 solution passes into the state of metagelatin, that is. a state 

 in which it no longer coagulates on cooling. Colouring masses 

 may be added to this vehicle, which may also be thinned by 

 the addition of weak alcohol. After injection, the preparations 

 are thrown into strong alcohol or chromic acid, which sets the 

 mass. 



