578 VEGETABLE DRUGS 



rancidity; a disagreeable alkaline taste, and an alkaline 

 reaction. Soluble in water and in alcohol; more readily 

 with the aid of heat. 



PREPARATIONS. 



Linimentum Saponis. Soap Liniment. (U. S. & B. P.) 



Synonym. — Opodeldoc. Lin. sapo. camph. 



Soap, 70; camphor, 45 ; oil of rosemary, 10 ; alcohol, 750 ; water to 

 make 1000. Made by solution, agitation and filtration. (U. S. P.) 



Emplastrum Saponis. Soap Plaster. (U. S. P.) 



Soap, 100; lead plaster, 900; made by solution in water and evapor- 

 ation. 



Sapo Mollis. Soft Soap. (U. S. & B. P.) 



Synonym, — Potassium oleate, sapo viridis, green soap. 



A soap prepared from potassa and a fixed oil. 



Derivation. — Heat linseed oil, 400, to 140° F. Dissolve 

 potassa, 90, in water, 450 ; add alcohol, 40 ; and stir the 

 mixture into the oil at the same temperature until it is 

 soluble in boiling water without the separation of oily drops. 



Properties. — A soft, unctuous mass, of a yellowish-brown 

 or brownish-yellow color. Soluble in about 5 parts of hot 

 water ; also in 2 parts of alcohol without leaving more than 

 3 per cent, of insoluble residue. 



PREPARATION. 



Linimentum Saponis Mollis. Liniment of Soft Soap. (U. S. P.) 



/9?/non^m.— Tinctura saponis viridis. 



Soft soap, 650; oil of lavender flowers, 20; alcohol, 300; water to 

 make 1000. Made by solution and filtra,tion. 



Castile soap is the best example of a pure soap. Mot- 

 tled castile soap contains iron as the coloring matter. The 

 household " soft soap " is not sapo mollis, but is made of all 

 kinds of rancid fats and is generally unfit for medicinal use. 

 Yellow laundry soap owes its color to resin. Super-fatted 

 soaps are of neutral reaction and unirritating. They are 

 used as a basis for medicinal soaps containing tar, carbolic 

 acid, etc. 



