166 VETERIXAKY 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 2.5 parts of al- 

 cohol, in 2 parts of ether, and in 80 parts of chloro- 

 form. Dose: H., 3 ij.-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 

 feebl)^ acid reaction. Soluble in 1.5 parts of water 

 and in 6 parts of alcohol. 



Lithii Scdicylas, 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^ 



