80 



Emplastrum Plumbi — Lead Plaster 



Lead Oxide 25.0 Gm. 



Olive Oil 25.0 Gm. 



Lard 25.0 Gm. 



Boiling water, a sufficient quantity. 

 Heat the olive oil and the lard by gentle heat until liquified 

 in a bright copper or other suitable vessel of a capacity not less than 

 four times the bulk of the ingredients, sift the lead oxide, through a 

 No. 80 sieve, upon the surface of the hot liquid and mix thoroughly. 

 Then gradually add 9 mils of boiling water, and boil the mixture, 

 constantly stirring, with a wooden spatula, and adding sufficient 

 boiling water, from time to time, to replace that lost by evapora- 

 tion, until the mass is homogeneous and a small portion removed and 

 dipped into cold water is found to be pliable and tenaceous. Then 

 remove it from the fire and wash several times with warm water to 

 remove the glycerin. Finally knead the mass until it is free from 

 water, roll it into cylinders of suitable size, and wrap them in paper. 



CHARTAE— PAPERS. Unofficial. 

 These are a class of preparations in which the medicine is 

 spread upon paper or absorbed by it. But one is official, Charta 

 Sinipis, Mustard Paper. In the U. S. F. of 1890 Charta Potassi 

 Nitratis was also official. 



I Chaeta Potassii Nitratis. 



Potassium Nitrate 1.0 Gm. 



Distilled Water 4.0 mils 



Dissolve the Potassium Nitrate in the water. Soak strips of 



unsized white paper in the solution and then dry them. The paper 



should be kept in well closed bottles. This paper was formerly 



used in asthma by burning it and inhaling the fumes. 



Chapter XL 

 UNOFFICIAL PREPARATIONS 



Many unofficial preparations are in so common use that it 

 seems best to include a few of them. The most common are :— 

 Tabellae — Tablets 



Tablet triturates 

 Compressed tablets 

 Hypodermic tablets 



