French specific gravity

French.—Specific gravity at 15° C., 0 91-0 933 slightly lasvo-rotatory up to -4 , bnt usually too dark to observe phenols, by absorption with 10 per cent, aqueous caustic potash, 25-55 per cent. refractive index fxt 210° C., 1 490-1 500 soluble in 1-1 5 volumes of 80 per cent, alcolaol. 

PROUSTITE. This ruby-silver mineral crystallizes in the hexagonal system its name is a product of its scarlet-to-vermilion color when first mined It is a silver arsenic sulfide. AgjAsS, of adamantine luster Hardness of 2-2,5 specific gravity of 5.55-5.64. Usual crystal habit is prismatic to rhombohedral more commonly occurs massive. Conchoidal to uneven fracture transparent to translucent color, scarlet to vermilion red. Light sensitive must be kept in dark environment to maintain its primary character. A product of low-tcmpcraturc formation in most silver deposits. Notable world occurrences include the Czech Republic and Slovakia, Saxony, Chile and Mexico. Found in minor quantities in the United States the most exceptional occurrence at the Poorman Mine, Silver City District. Idaho where a crystalline mass of some 500 pounds (227 kilograms) was recovered m 1865, It was named for the famous French chemist, Louis Joseph Proust. 

Bautne Scale—This scale is used widely in connection with the measurement of aads and light and heavy liquids, such as syrups. The scale originally was proposed by Antoine Baum6. a French chemist, in 1768. The scale has been widely accepted because of the simplicity of the numbers which represent liquid specific gravity. Two scales are in use ... 

Chloraretone was introduced by the French in November, 1914, as a substitute for ethylbromacetate in hand and riHe gas grenades. It is obtained by the direct chlorination of acetone and is a clear liquid, of 1.16 specific gravity, which boils at 119 C. (246.2 F.), yielding a vapor 3.7 times heavier than air. Chloracetone is only slightly soluble in... 

The Sardinian oil has been examined by Francesconi and Sernagiotto. (Atti. R. Acad. Lincei, Roma, 1913 (5), 22, i, 231-7 and 313-17, 382-6) It differs from the French oil the only constituents common to both being dill-apiole, p-cymene and crithmene, a new terpene. Crithmene has the formula shown above and appears to be delta,l, 7-4,8-menthadiene. It boils at 178-180°, specific gravity at 12°, 0.8679, nD 14806. Source Finnemore 1926... 

II. For tbo detectiou of hemp, linseed, fish, gallipoli, and French nut oils, 1 volume of snlphuric acid of specific gravity 1.530, agitated with 5 volumes of oil, noil the mixture allowed to stand for 5 minutes. Dndcr thi.s test the above mentioned oils alouc as-anme a decided coloration. 

Ilf. Sulphuric acid of specific gravity used similar to the preceding, aud the effects noted after standing 2 minutes, affords a test under which tho coloratiou.s arc distinct and well marked, ami will detect 16 per cent, of rapcsccd oil iu olive oil, of lard ml iu poppij Oil, of French nut oil in oUve oil, and of fish oil iu neat foot oil. 

For household or laundry purposes he uses by pre-Terence a soap made of oleic acid mixed, with common tallow or animal grease and resin if necessary, he adds a certain proportion of French chalk to give fiimness to the soap. The solution of silicate of soda should have a specific gravity of about 170 by Twaddeil s hydrometer. 

Asjpic oil, from the flowers of Lavandula spica, obtained from France and Spain, and extensively employed in perfuming household and cheap toilet soaps also frequently found as an adulterant in lavender oil. Specific gravity at 15° C., 0 904-0 913 optical rotation, French, dextro-rotatory up to + 4°, rarely up to + 7°,... 

Petitgrain oil, obtained by distillation of the twigs and unripe fruit of Citrus bigaradia. There are two varieties of the oil, the French and the South American, the former being the more valuable. Specific gravity at 15° C., 0 886-0 900 optical rotation, -3° to + 6° refractive index at 20° C., 1 4604-1 4650 esters, calculated as linalyl acetate, 40-55 per cent., for the best qualities usually above 50 per cent. soluble as a rule in 2-3 volumes of 70 per cent, alcohol, but occasionally requires 1-2 volumes of 80 per cent, alcohol. 

French and Dalmatian.—Specific gravity at 15° 0., 0 900-0 916 optical rotation, usually dextro-rotatory, up to -f- 15°, but may occasionally be Iflevo-rotatory, especially if stalks have been distilled with the leaves ester, calculated as bornyl acetate, 1-6 per cent. total borneol, 12-18 per cent. usually soluble in 1-2 volumes of 82 5 per cent, alcohol. 

According to Umney and Bennett, the French so-called savin oil is probably distilled from the leaves and twigs of Juniper us phcmwea which accounts for its difference from the German and English distillates. This French oil has a specific gravity about 0-890 rotation -H 4 30 esters 9-3 per cent. total alcohols as sabinol 17 1. 

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