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ACANTHITE

Natural silver sulphide, containing 87 per cent, silver, found in Colorado.

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ALABASTER

A native form of finegrained gypsum or calcium sulphate CaSOJ, ued in sculpture and for ornamental applications.

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ANTHRAQUINONE

2C6II4>A product of the oxidation of anthracene. It crystallizes in yellow needles, melts at 285 degrees C., and is soluble in alcohol, ether, and acetone.

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ADRENALIN

A nearly white crystalline substance prepared from the suprarenal glands of sheep and cattle, used in medicine. It melts at trom 205 degrees to 212 degrees C., and is slightly soluble in water but insoluble in alcohol, ether, and chloroform, and is used in medicine.

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AMYLACETATE

C7H14Q2 0r CH3C01C5H,1An alcoholic solution of this substance forms the essence of pears. It is produced by the slow action of acetic acid upon amyl alcohol, and is made by distilling potassium acetate or lead acetate in admixture with amyl alcohol and strong sulphuric acid. It is a colourless liquid, of sp. gr. oM66, nearly insoluble in water, having an ethereal aromatic odour, and is largely used for flavouring purposes and as a solvent of cellulose, etc.

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ATTAE OF ROSES

is obtained by distilling the fresh flowers of Rosa damascene with water, and is made in Bulgaria, France, Turkey, Persia, and India, 3 drachms being obtained from 100 pounds of the flowerpetals. The distilled oil is pale yellow, and has a sp. gr. of o853 to o8f2. Its refractive index is 1

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ARYLS

The group of aromatic radicals amline is typical of the socalled arylamines

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ANGLESITE

Native, lead sulphate, found in Spain, North America, and Cumberland, probably produced by the oxidation of galena.

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ARABIIyOCSE

A white crystalline body soluble in water, is a constituent of many plants, and can be made by boiling gum arabic or cherry gum with dilute sulphuric acid.

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AURINE

A dye which crystallizes in beautiful green needles and prisms of a metallic lustre, and can be made by heating phenol with a mixture of sulphuric and oxalic acids to a temperature of from 130 degrees to 150 degrees C. Its constitution is shown by the structural formula:

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