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NEROLI OIL

A reddishyellow essential oil distilled from orange flowers, of which there are several varieties. Sp. gr. about C87 to o88, soluble in alcohol, ether, etc. Its constituents include linalyl acetate, linalool, geraniol, and limonene.

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NITROUS ETHER

or SWEET SPIRIT OF NITREA drug, used as a diuretic and stimulant, prepared by the action of nitric acid upon alcohol. It is a yellowish, aromatic, volatile, and inflammable liquid of sp. gr ogoo, boiling at C., soluble in alcohol and ether,

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NITROSO COMPOUNDS

contain the nitroso group N:0 for example, nitrosobenzene.

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NAPHTEOL

is a white, lustrous substance, soluble in benzol, alcohol, ether, and chloroform, and slightly soluble in water, made by fusing betanaphthalone sulphonate with caustic soda and subsequent distillation. It is used in making dyestuffs and as an antiseptic.

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NITROGENIZE

Combination of nitrogen or nitrogenous groups with other substances.

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NUX VOMICA

The dried seeds or beans of a species of apocynaceous plants, which grow in Southern Asia and Northern Australia, and yields the two bases strychnine and brucine. Strychnine is also obtained from the Sir. Colubrina tree and from the Sty. S. Ignatii and S. Tieiite.

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NUCLEINS

Albuminous substances contained in many animal anil vegetable tissues.

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NORDHAUSEN ACID

Fuming concentrated sulphuric acid originally prepared at Nordhausen in Saxony by the distillation of ferrous sulphate, the gas generated in [his way being condensed in ordinary sulphuric acid. It really consists of a mixture of sulphuric acid and sulphur trioxide.

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NOTATION

The use of symbols and formulae to denote the constitution of chemical substances.

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NIUROSINES

A class of black dyes prepared by heating aniline and its hydrochloride with nitrobenzene and a metal. They are of arious solubilitiessome in water, some in alcohol, and others in oiland are used in making polishes, varnishes, inks, and in the dyeing and leather trades.

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