Oii = 16.

(Syn., Fr. Oxygene; Ger. Oxygen, Sauerstoff.)

The element oxygen (Gr.

Oxygenium Oxygen 872

acid, sharp, +

Oxygenium Oxygen 873

producing - i. e., a generator of acids, once supposed a component of all acids) is official, being most widely distributed and abundant, excelling all others in quantity, as it constitutes 89 p. c, by weight, of the water, 20 p. c. of the atmosphere, 30-50 p. c. of the rocks, and 45 p. c. of the total weight of our earth, besides being in most animal and plant tissues; it occurs in the free state, also in combination, uniting with acid and basic substances to form oxides.

Manufacture: Heat together, at low red heat, potassium chlorate (4-5) and manganese dioxide (1), and pass the evolved gas (oxygen +)through a wash-bottle containing an alkali - 5KC1O3 + MnO2 = 3KCIO4 + 2KC1 + MnO2 + O3. It is a colorless, odorless, tasteless gas, supports combustion more readily than air, in it glowing wood bursting into flame, soluble in water (.34), alcohol (3.6), non-inflammable, neutral reaction; contains 95 p. c, by volume, of 0. Impurities: Carbon dioxide, halogens, acids, bases.

Properties and Uses. - In diseases of respiratory and circulatory systems where an imperfect supply reaches the tissues, thereby improving the condition of the blood, cyanosis from impaired respiration, disagreeable after-effects of ether, chloroform, dyspnoea from Bright's disease or diabetes, mechanical hindrance. For convenience usually it is compressed hydraulically at very low temperature (225 pounds - to 1/15 its volume) in metal (steel) cylinders, to which a mouthpiece is attached for inhalation; it may be inhaled from a jet under the nostrils.