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Salts of Dinitro-n-Naphthol with Various Metallic Bases. BY T. H. NORTON A N D H. LOEWENSTEIN. J . A m . Chem. SOC., 19,g23-g27.--The preparation and properties of the lithium, magnesium, zinc, and copper salts of dinitro-a-naphthol are described. T h e solubilities of the ainnioniuin and calcium salts in water, alcohol, and ether are also given. On Certain Amine Derivatives of Dinitro-a-Naphthol and its Chlorination. BY T. H. NORTONA N D IRWIN J. SXITH. /. Am. Chem. Soc., 19, gz7-g3o.-The trimethylamine, aniline, orthotoluidine, and dimethylaniline salts of dinitro-a-naphthol are described. By the action of chlorine on the dry phenol a substance was obtained which could not be purified but mas free from nitrogen. Carbon Compounds used in Medicine, Classified According BOGERT. to Chemical Structure. BY MARSTOX TAYLOR School of iTfi7ze.s Q u a d . , 19,47--8S.--This is the first paper of a series to be published under the above title. T h e properties and applications of the inethane derivatives used in medicine are described. ilINERALOGlCAL AND GEOLOGICAL CHEMISTRY. W. 0 CROSBY,REVIEWER
ilineralogical Notes on Cyanite, Zircon, and Anorthite from North Carolina. BY J . H. PRATT. -4m.J. Sci., 155, 126-128. These notes are chiefly crystallographic ; but a single analysis of the feldspar is given, which identifies it as an anorthite. Four New Australian Meteorites. BY HEXRYA. WARD. are typical siderites ; and although representing independent and rather widely separated falls, the analyses disclose a marked uniformity of composition, especially as regards the proportions of iron and nickel.
Am.J . Sci., 155, 13j-140.-These
On Rock Classification. BY J . P. IDDINGS.J . Geol., 6 , 92is a general discussion of the principles of rock classification, as applied to the igneous rocks, and with special reference to the chemical composition and relations of the rocks. X o fewer than 928 chemical analyses of igneous rocks are compared graphically as regards : first, the silica ; second, the ratio between the silica and alkalies ; and third, the ratio between the alkalies, potash and soda. These comparisons lead to various interesting results, one of which is that the variations in all of the cheniical constituents, other than silica, must increase in proportion a s silica decreases ; from which it follows that the I I I .-This
Mincra logical a n d Gcological Chemistry.
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number of different kinds of rocks possible for any given percentage of silica is much greater the lower the percentage of silica. T h e chemical relations of genetically connected series of rocks are next discussed, and various other topics, the general conclusion being that a systematic classification of all kinds of igneous rocks based, as it should be, upon their material characters, cannot properly be expected to take cognizance also of the laws governing their production, eruption, modes of occurrence, and solidification, as well as their subsequent alteration.
Nodular Granite from Pine Lake, Ontario. BY FRANK D. ADAMS. Bull. Geol. SOC. A m . , 9, 163-17z.-The nodules, which the author regards as a product of the primary magmatic differentiation of the granite, are composed chiefly of quartz, muscovite, and sillimanite ; and the chief peculiarity which they present lies in the fact that the portion of the magma which thus separated out was more acid than the magma as a whole, which is very unusual. T h e analyses show that although the granite is a very acid one, the chief difference between it and the nodules is that the latter are richer in silica and alumina and poorer in alkalies than the granite itself. The Phosphate Depositsof Arkansas. BYJOHN .:C BRANNER. Trans. Am. Inst. Min. Eng., 26, 580-598.-This detailed account of these, as yet, unworked deposits is accompanied by numerous analyses of the nodular phosphate rock, the amount of phosphoric acid ranging from 22.62 to 33.86 per cent. T w o analyses of the black and green Eureka shales, with which the phosphate rock is invariably associated, are also given. An Olivinite Dike of the ilagnolia District (Colorado) and the Associated Picrotitanite. BY MILTON C. WHITAKER. PYOC. Col. Sci. SOC., Feb. 5, 1898, 1-14.-Two analyses of this highly altered olivine rock are given, their most striking features being the low percentages of silica (22.24 and 21.90) and the relatively high percentages of magnesia, carbon dioxide, and the alkalies. T h e secondary and accessory minerals include serpentine, magnetite, picrotitanite, garnet, calcite, chlorite and micas. T h e picrotitanite or magnesia nienaccanite is the most interesting of these, and three analyses of it by different methods are given and discussed. Phosphatic Chert. BY J . H. KASTLE, J . C. W. FRAZER, GEO. SULLIVAN.Am. Chem.]., 20, 153-159.-0ne of the most characteristic formations in central Kentucky is a deposit of chert which marks the upper boundary of the Trenton limestone. T h e limestone immediately below the chert is characterized by thin layers which are highly phosphatic, containing AND
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from 1.46 to 31.815 per cent. of phosphoric acid, P,O,, the average being about 15.9 per cent. ; and this rock is probably the source of the remarkable and enduring fertility of the soil of the Blue Grass section. I t has more recently been discovered that the chert itself is invariably phosphatic ; and 39 analyses are given, showing from 0.179 to 3.j per cent. of P,O,, with an average of 1.684 per cent. Other analyses are quoted to show that the chert contains four or five times as much P,O, as the normal Trenton limestone or the soils derived from it. Cherts from the Birdseye limestone and from the Permian limestone of Russia were also analyzed and found to contain 0.5 to 3 per cent. of P,O,. Other analyses tend to show that the phosphate is an original feature of the chert, while the fact that the porous, weathered cherts are most highly phosphatic suggests that the phosphate may be the insoluble residue of limestone which was once intimately associated with the chert. A chert breccia is also described, the dark-brown cementing substance of which gave in four analyses from 3 to 4.5 per cent. of P,O,, which is supposed to exist in the rock as phosphate of iron.
