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HISTONES

A certain class of proteins precipitable trom solution by ammonia.

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HYDRAZINE

A colourless liquid which boils at 1135 degrees C., made by reduction from nitrosamine The name is also given to an organic compound containing two amido groups.

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HENBANE

from Hycscyamus nigerA poisonous plant containing two alkaloids named hyoscyamine and hyoscine . The plant is stated to grow wild on the north coast of Somerset. Hyoscine is a powerful narcotic and hyoscyamine exhibits mydriatic action. Wild Manchurian henbane seeds have been found recently to contain scopolamine instead of hyoscyamine.

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HEDERIC ACID

A derivative prepared from a glucoside contained in ivy leaves and seeds.

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HOMATROPINE

A white, crystalline, poisonous base allied to atropine, which melts at 955 degrees C. and exercises a mydriatic action or power of dilating the pupil of the eye.

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HOPS

is obtained from hop cones which yield it upon distillation with water, being derived from the lupulin or yellow bitter powder which is contained in them, to the extent of from about 8 to 12 per cent. It is green in colour, has the odour of thyme, and is said to contain geraniol and a terpene. It is soluble in alcohol and ether and has a sp. gr. o855 to o88o.

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HEHNER VALUE

represents the percentage of insoluble fatty acid + the nunsaponifiable constituents.

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HYDROS

An abbreviated name for bydrosulphite of sodium, used as a decolourizing agent, by removal of iron compounds frum soap after the process of saponification is completed.

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HEMPSEED OIL

is obtained by pressing or extraction from hempseed, and is of faint green colour, nondrying in character, and turns brownishyellow upon standing. It has a sp. gr. of 0925 to 0928, a saponification value of about 1925, and an iodine value of 148. It is soluble in ether, benzol, and carbon disulphide, and is used for illuminating purposes and in making soft soaps, paints, and varnishes.

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HAILCRIS

A British white glass for making miners

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