NAMES, PROPERTIES, AND DOSE OF MEDICINES. 155 
to mix with nitrous fumes obtained from the decomposition of 
nitre. Used medicinally in the diluted form, and is some- 
times given in typhoid fevers with advantage. It also makes 
a good gargle for sore throats. Dose of the diluted acid 
(1 part acid to 9 water) 5 to 30 drops. 34d. per oz. 
Sutpaurous Acrp.—Made from sulphuic acid, charcoal, 
and water. Used externally for all parasitic affections of the 
skin. When locally used it should be diluted with 2 or 3 
parts of water. Much advantage has been found by inhaling 
the acid in typhoid and typhus fevers, catarrh, hay fever, and 
rheumatism. Dose, 4 to a teaspoonful. Use carefully. 3d. 
per oz. 
Tannic Actp.—An acid obtained from galls. Is a very 
strong astringent, used internally and externally, for hem- 
orrhages or bleedings, piles, chilblains, &c. Use care- 
fully. 1s. per oz. 
Aconirz, TrncturE or Roor.—Is a powerful poison. Used 
in moderate doses it is very good in rheumatic neuralgia and 
fevers. Dose, 5 to 10 drops. Dangerous. 1s. per oz. 
Anuin.—Active principle of the tag alder bark. Used 
for scrofula, eruptions of the skin, rheumatism. Dose, 2 to. 
10 grains. Use carefully. 4s. per oz. 
Ators.—Three chief varieties of aloes are known in com- 
merce—the Cape, the Socotrine, and the Barbadoes, of which 
the last two are most used in this country. They are all 
cathartic, operating slowly but certainly. Owing to its 
excessively bitter and somewhat nauseous taste, it is most 
conveniently given in pills. Dose of the powder from 5 to 10: 
grains. Use with care. 6d. to 9d. per oz. 
ALEotn, the active principle of aloes. Dose 2 to 5 grains.. 
Dangerous. 4s. per oz. 
Ammonia CarBonaTE.— Manufactured by subliming a. 
mixture of the chloride or sulphate with chalk. Chloride of 
ammonia and chalk are heated together in iron pots or retorts, 
