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OSAGE ORANGE

A material obtained from the bark of the osage orange tree, indigenous in the United States, containing some 25 per cent, tannin, and used also as a dye.

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OSMIUM

Atomic weight, 191 sp. gr., 2247; meltingpoint, 2,700 degrees C. A rare element of the platinum group, and the most refractory; found in alloyed association with iridium in certain platinum ores, and notably in socalled osmitidium, in parts of which the osmium content runs as high as from 30 to }.o per cent. It is a hard, bluishwhite, and the heaviest known metal, possessing catalytic properties. It can be prepared from its oxides by reduction; is known in crystalline and amorphous forms, and burns brightly when strongly heated, forming osmium tetroxide. The amorphous variety is dissolved by aqua regia and the tetroxide is thus produced, but the compact form is insoluble in all acids. Four oxides are knownviz., OsO, 0s203, 0s02, and OsOt and there are salts corresponding to the sesquoxide. Three chlorides are knownOsCl2, OsCl3, and OsCl4.

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ORGANIZED

Arranged in definite form or structure, such as cells, fibres, membranes, hair, skin, etc.

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OTOBA BUTTER

The fat expressed from the fruit of My ristica otoha, containing glycerides and some sesquiterpenes; saponification value, 185; and meltingpoint, 34 degrees C.

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OIL CAKE

The cake remaining after the expression of oils from seeds. Homemanufactured Cakes and Meals.Linseed cake containing not less than 8 per cent, oil, cottonseed cake, undecorticated groundnut cake, semidecorticated groundnut cake, decorticated groundnut cake, palmkernel cake, rape cake, copra cake, sesame cake, soya cake, extracted palmkernel meal, extracted rape meal, extracted soya meal. Imported Cakes and Meals.North American linseed cake, Argentine linseed cake, Canadian linseed cake, Australian linseed cake, Spanish and Portuguese linseed cake, Egyptian cottonseed cake, decorticated cottonseed meal, decorticated cottonseed cake, repressed cotton cake, semidecorticated cotton cake, copra cake, palmkernel cake, Rangoon rice meal, Italian rice meal, Canadian rice meal, Egyptian rice meal, gluten feed, maizemeal cake. The feeding values of cakes are chiefly represented by their protein constituents.

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OXYGENATED WATER

Water mechanically charged with oxygen gas and not to be confounded with hydrogen dioxide.

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OHM

The international unit of resistance is that offered by a column of mercury io63 cm. in length, i4452i grms. in mass, and at the temperature of melting ice, to an unvarying electric current

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OLEFINES

A class of unsaturated hydrocarbons of ascend ing boilingpoints and general formula CdII2,

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OKOL

A disinfectant and larvicide, consisting of an emulsion of phenoloids: miscible with water.

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ORTHOCOMPOUNDS

are substitution products derived from benzene, in which the substituting radicals or groups are constitutionally situate in certain definite positions in the nucleusorthocresol, for instance.

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