ALTERATIVES. 77 



ulcers, chronic and glandular swellings, mange, scab, 

 scurvy skin diseases ; for the latter usually combined 

 with tar and sulphur. Used also to destroy lice. 

 Must be used with care, especially if applied over a 

 large area, as mercurial poisoning might result from 

 absQi'ption. 



Unguentum Hydrargyri Ammoniati, ointment of 

 ammoniated mercury or white precipitate ointment 

 (ten per cent.), is used as a parasiticide in various 

 forms of eczema, chronic inflammation of the joints, 

 and conjunctivitis. 



Oleatum Hydrargyri (ten to twenty per cent.); 

 yellow oxide mercury 10, oleic acid 90, U. S. P. 

 Used for same purposes as the ointment, but is prob- 

 ably more easily absorbed ; if for painful exostoses, 

 combine with morphine. 



Hydrargyrum pum Creta, gray powder, mercury 

 with chalk (triturate thoroughly 1 part mercury 

 with chalk 2 parts, U. S. P.). Used as antacid, lax- 

 ative, and alterative. For calves or foals, in diarrhoea 

 or bilious indigestion, five to fifteen grains on the 

 tongue, or with gruel and ginger or other aromatic 

 stomachics. Dose D., gr. ss.-x. 



Hydrargyri Chloridum Mite, mild chloride of 

 mercury, mercurous chloride, subchloride of mer- 

 cury, calomel, aquila alba— Hg.Cl,— a white, impal- 

 pable powder, permanent in the air, odorless and 

 tasteless, insoluble in water, ether, or alcohol. It is 

 blackened when brought in contact with water of 

 ammonia. 



Actions and Uses. — Irritant, stimulant, altera- 



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