INFUSIONS LIQUORS 723 



boracis contains one of acid and six of the solvent. Glycer- 

 inum amyli is made with one ounce by weight of starch, six 

 and a half fluid ounces of glycerin, and one and a half of 

 water. Glycerina of lead subacetate, tragacanth, boric 

 acid, and salicylic acid are also used. 



INFUSIONS 



Infusions are solutions prepared by digesting vegetable 

 substances in hot water. Fourteen of the twenty-two 

 officinal infusions are made with one part of the powdered 

 or cut drug, to twenty of water. To prevent solution of the 

 starch of the root, infusions of calumba and quassia are 

 made with cold water. The process is generally conducted 

 in stoneware jars, provided with a cup having perforated 

 sides and bottom, fitting into the top of the jar, extending 

 about half-way down, and containing the solid matters to 

 be infused. Digestion is effected on a stove, and is continued 

 for fifteen minutes to half an hour. The infusion, when cool, 

 is generally strained, but for veterinary purposes and for 

 immediate use decanting is often sufficient. Unless care- 

 fully bottled and corked while hot, infusions soon spoil, 

 especially in warm weather. Their keeping is sometimes 

 improved by concentration, by evaporation, or by addition 

 of alcohol, or about a quarter grain of benzoic acid to the 

 ounce. Examples infusion of quassia, gentian, ergot, and 

 calumba. 



LIQUORS-SOLUTIONS-LOTIONS 



The B.P. enumerates many liquors or solutions, nearly 

 all containing inorganic bodies, or alkaloids, dissolved 

 in water alone, or with other solvents. They vary greatly 

 in strength and dose. The B.P. Liquor Hydrargyri Per- 

 chloridi contains gr. ygth in a fluid drachm. Those 

 containing arsenic, atropine, morphine, and strychnine 

 have about 4J grains of the poison in the fluid ounce, or one 

 grain in 110 minims. The liquors chiefly used by veterin- 

 arians are liquor ammonise, liquor ammonii acetatis, liquor 

 iodi, liquor arsenicalis, liquor ferri perchloridi, liquor 



