166 VETEKIIfAEY MATERIA MEDICA. 



from stranguli (usually combined with oil of turpen- 

 tine). Externally — as an ointment in grease, scratch- 

 es, eczema, scab, mange, and to destroy lice and fleas. 

 The crude acid is used as a disinfectant and deodorant 

 in stables, kennels, etc. 



AciDUM Salicylicum— Salicylic Acid. 



Acidum Salicylicum, Salicylic Acid, an organic 

 acid, which was originally prepared from salicin, a 

 crystalline glucoside obtained from several species of 

 salix (willow) and populus (poplar). Salicylic acid is 

 now prepared synthetically from carbolic acid by the 

 reaction of sodium and carbonic anhydride. It occurs 

 in fine, white, light, prismatic, needle-shaped crystals, 

 permanent in the air, free from odor of carbolic acid, 

 but sometimes having a slight, aromatic odor, of a 

 sweetish and slightly acrid taste and an acid reaction. 

 Soluble in 450 parts of water and in 3.5 parts of al- 

 cohol, in 3 parts of ether, and in 80 parts of chloro- 

 form. Dose: H., Sij.-vi.; D., gr. v.-xv. 



Preparations. — Sodii Salicylas, sodium salicy- 

 late. Small, white, crystalline plates, or a crystalline 

 powder, permanent in the air, odorless, having a 

 sweetish, saline, and mildly alkaline taste and a 

 feebly acid reaction. Soluble in 1.5 parts of water 

 and in 6 parts of alcohol. 



Lithii Salicylas, lithium salicylate. A white 

 powder, deliquescent on exposure to air, odorless or 

 nearly so, having a sweetish taste and a faintly acid 

 reaction. Very soluble in water and in alcohol. 



Salol, salicylate of phenyl. A fine, crystalline, 



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