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GOLDBEATERS SKIN

Peritoneal membrane from the intestinal tube of the ox and other animals, soaked in a weak solution of potash; then, after washing, stretched and beaten out with a hammer, and finally treated so that it cannot undergo putrefaction.

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GUTTAPERCHA

A natural, dark, hardened juice of the Saputacea or guttapercha trees which grow in Borneo, Brazil, Malay, Singapore, Ceylon, etc. It exudes from incisions made in the bark, and in a pure state is white, insoluble in alcohol but soluble in carbon disulphide, turpentine, and ether. It becomes soft and impressionable when warmed in hot water, melts at about 120 degrees C., and is largely used as an insulating material for covering cables and electric wires, as a covering for golf balls, in dentistry; for making bottles, funnels, jugs, taps, valves, and many other articles. Guttapercha is a hydrocarbon, having near chemical relationship to turpentine and rubber.

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GALLIPOLI

A crude olive oil used in the textile industries.

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GEDDA

The name of certain East Indian waxes, stated to contain 48 per cent, ceryl alcohol associated with fatty acids, etc.

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GELSEMININA

A yellowishwhite, crystalline alkaloid, of meltingpoint 1720 C. soluble in alcohol and ether, which forms salts, and has mydriatic properties. It is extracted from the dried rhizome and routs of yellow jasmine, and is imported from the United States.

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GLUCINUM or BERYLLIUM

atomic weight, 91; sp. gr., about J

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GRAPE SUGAR or GLUCOSE

See Dextrose, Glucose, Sugars, and Carbohydrates.

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GIN

is spirit distilled from fermented wort of malted barley, and flavoured with jumper berries by distillation or otherwise.

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GUAIACWOOD OIL

A thick, viscid oil, apt to become crystalline, distilled from the wood of some species of guaiacum, known as “balsam wood” in South America. * t is soluble in alcohol and ether, has a sp. gr. of about oyfi to og8, with optical rotation 6 degrees to and is used in perfumery.

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GERANIUM OIL

Distilled from the herbs Pelargonium yadula, P. capitatum, and P. odoratissimum in Algeria and other parts of Africa, is of pale yellow or greenish colour, having geraniol as its chief constituent. It is soluble in alcohol and ether, has a sp. gr. of 0886 to 0898, and rotation of 70 to 120. It is used in perfumery. The Turkish Oil, which comes really from the East Indies, has a sp. gr. of 0890 to 0900, and is distilled from the grass of a species of Andropogon. It is very similar to the “rose” oil, and used for the same purposes. Japanese oils, obtained respectively from Pelargonium graveolens, P. radula, and P. denticulatum, grown near Tokyo, and recently examined, showed sp. grs. of 09178, 09234, and o886o, and total geraniol content as follows: 231 per cent., 263 per cent., and 635 per cent., the P. denticulatum variety being, therefore, the most valuable for perfumery.

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