45 



BMULSA— EMULSIONS 



Emulsions are aqueous preparations for internal use, in which 

 resinous or fatty substances are suspended by means of mucilage or 

 other viscid material. Acacia, Tragacanth and Yolk of Egg are 

 often used for this purpose. ( Emulsifiers) . In some instances, as 

 in the case of emulsions of gum resins, the gum needed to form the 

 emulsion is found present with the resin. The seeds of some plants 

 also contain an albuminous substance, which serves as an emulsi- 

 fier for the oil also present in the seed, rendering the addition of 

 gums necessary. The emulsions are all quite unstable and accord- 

 ingly should he freshly prepared for use. 



In making emulsions of fixed oils, in which case Emulsion of 

 Cod Liver Oil serves as the best example, either of two processes 

 may be employed : the English and the Continental. The latter 

 is usually the more satisfactory. With this method a nucleus or 

 primary emulsion is prepared first with certain proportions of the 

 ingredients, and this can be further diluted with water or flavor 

 without fear of splitting, (Separation). The proportion by weight 

 is : oil 4, water 2, and gum 1, or in other words use twice as much 

 oil as water, and twice as much water as gum. The nucleus is then 

 diluted ivith water or flavor to the desired amount. 



The following are official : 



Emulsum Amygdalae 

 ' ' Asaf oetidae 

 " Olei Morrhuae 

 " Olei Terebinthinae 



Emulsum Olei Morrhuae 



Cod Liver Oil 25.0 mils 



Acacia, in fine powder 6.25 Gm. 



Syrup 5.0 mils 



Methyl Salicylate 0.2 mil 

 Water, a sufficient quantity 



to make 50.0 mils 



Thoroughly mix the acacia with the cod liver oil in a dry 

 mortar or other suitable vessel, then add at once 12.5 mils of water 



