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NEROL

An aromatic alcohol of sp. gr. o88i isomcric witH geraniol, occurring in the finer extracts of rose and neroli.

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NAPHTHYLAMINES

are socalled “intermediates” for dyes, and include anaphthjlamine, a colourless, crystalline compound of disagreeable odour, which melts at 50 degrees C., boils at 300

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NULOMOLINE

A proprietary article used, for some purposes, as a substitute for glycerine, being a solution of partly inverted sugar of sp. gr. 1.4.

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NITROPHENOLS

2 are all crystalline substances soluble in alcohol and ether, the meta compound being used for manufacturing the dyes known as “rhodamines” whilst the para compound is used in making phenacetin, etc. The ortho compound is yellow and melts at 450 C. the meta compound is also yellow and melts at 96 degrees C., whilst the para compound is colourless and melts at 1140 C.

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NARKIMETAL

A proprietary acidresisting silicon cast iron alloy used in making plant for concentration of sulphuric acid, acid elevators, pipes, valves, etc.

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NITROTOLUENES

A class of compounds produced by the nitration of toluene. The para compound is a solid, crystalline body employed for making fuchsine and other dyes in common with the ortho compound, which is a liquid substance and can be used in common with nitrobenzene in preparing socalled “oil of mirbane.” The para compound melts at 510 C. and boils at 234 degrees C., whilst the ortho compound boils at 218 degrees C.

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NEURINE

An amine base obtained from brainsubstance and bile, and which upon oxidation with strong nitric acid gives muscarine. It is nearly related to choline.

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NITROBENZENE, or OIL OF MIRBANE

, is a yellowish liquid of sp gr. i,i986 and boilingpoint about 2ii degrees C., prepared from benzene by the action of a mixture of sulphuric and nitric acids, and can also be produced by the action of strong nitric acid on turpentine. It has an intense odoui of oil of bitter almonds, is soluble in alcohol and ether, and is much used in perfumery and as a flavouring principle, also in the dye industry. There are several dinitrobenzenes and trinitrobenzenes 3 respectively.

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NORMAL STANDARD SOLUTIONS

Contain an equivalent weight of the substance, dissolved in 1 litre, and decinormal solutions are of onetenth that strength both are used in “Volumetric Analyses.”

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NICOTINE

An oily, colourless, alkaloidal liquid of sp. gr. 1009, constituting the acrid basic principle of tobacco, in which it is found present in amount varying from 2 to 8 per cent. Nicotine is not present in the seed of the plants but appears in the young plant immediately the chlorophyll begins to function, and originates in the leaf. It is soluble in water, alcohol, and ether. Preparations of it are extensively used for horticultural purposes as an insecticide, also as a dip for the destruction of ticks and other pests on the wool of sheep.

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