The oxidizing disinfectants destroy the offensive or noxious products of organic decomposition, in the same way as all organic substances are destroyed by fire. They actually burn them up; simply the phenomenon of flame or ignition being wanting. They operate in two methods; either by directly combining with the several constituents of the body to be destroyed, as in the case of ozone, or by furnishing oxygen to it through the decomposition of other bodies, as chlorine, iodine, and bromine. I shall consider them in the order here stated.