Ammonia

a colorle , pungent gas, with a strong alkaline reaction. It can be liquefied at the pre ure of seven atmospheres at 15°. Ammonia is obtained by the dry distillation of animal or vegetable matter containing nitrogen; horns, hoofs, ete., produce large quantities; hence its name of spirits of hartshorn, Guano consists chiefly of urate of ammonia. But ammonia is now obtained from the liquor of gasworks, coal containing about 2 per cent. of nitrogen. It is; used in medicine as an antacid and stimulant; it also increases the secretions.