26 PHARMACY 



also contain an albuminous substance, which serves as an emulsifier 

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

 unnecessary. The emulsions are all quite unstable and accordingly 

 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 pri- 

 mary emulsion is prepared first with certain proportions of the ingre- 

 dients, 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 with 

 water or flavor to the desired amount. 



The following are official : 



Emulsum Amygdalae 

 Emulsum Asafoetidse 

 Emulsum Olei Morrhuse 

 Emulsum Olei Terebinthinse 



MISTURAE — MIXTURES 



Mixtures are aqueous preparations for internal use containing in 

 suspension insoluble, non-fatty substances. They are not permanent 

 as a rule and should be freshly prepared. They should be dispensed 

 with a shake label. Two are official, Mistura CretsB and Mistura 

 Glycyrrhizse Composita. 



MAGMAE 



Magmse are aqueous preparations containing thick, tenacious pre- 

 cipitates. Two are official: Magma Bismuthi and Magma Mag- 

 nesise. 



SPIRITUS — SPIRITS 



Spirits are alcoholic solutions of volatile substances. As in case 

 of waters, the volatile substances may be solid or liquid. Spirits 

 containing some aromatic flavoring principles are frequently called 

 " essences." They may be prepared in the following ways : 1. 

 Dilution or solution. 2. Solution by maceration. 3. Solution by 

 chemical action. Fifteen are official. 



The following table of fifteen official spirits indicates the method 

 by which prepared: 



Simple Solution 



Spiritus Ammonias Aromaticus Aromatic Spirits of Ammonia 

 Spiritus Amygdali Amarse Spirit of Bitter Almond 



