Charcoal is obtained from the combustion of bones, - carbo animalis, animal charcoal, or bone black - and of wood - carbo ligni, wood charcoal.

Charcoal absorbs and condenses many gases and vapors, coloring matters, alkaloids, and other substances in quantities many times greater than its own bulk; and when exposed to the air it thus increases rapidly in weight. For this reason, when intended for medicinal purposes it must be kept carefully covered in well-stoppered bottles.

Externally it is used as an absorbent and deodorant, and internally as a carminative. It may be given between two slices of bread and butter, or mixed with wine. Charcoal does not enter the system, but is entirely expelled by the bowels. Average dose, gr. xv.-I Gm.

Liquor Hydrogenii Dioxidi. Solution Of Hydrogen Dioxide. Solution Of Hydrogen Peroxide

A slightly acid watery solution of hydrogen dioxide, containing, when fresh, about 3 per cent, by weight, of the pure dioxide, corresponding to about ten volumes of oxygen.

It is used in the treatment of ulcers, fetid suppuration, diphtheritic membranes, etc. Its virtues depend on its readiness to yield oxygen to all oxidizable substances.

1 An inflammable mineral substance.

As it soon loses strength, it should be kept in small quantities, in a cool place, not exposed to the light, and as it is an expensive article, should be carefully used.