40 Reviews—Russian Meteorite. 
concluding species among the phosphates and with the greater number - 
of arsenic compounds. A conspicuous feature of the work consists of 
the ample discussion of chemical methods which are introductory to 
the descriptions of the principal mineral groups; thus, in the present 
part we find an able article from the pen of Professor Dittrich on the 
analysis of the arsenates. The descriptions of the several species 
seems on the whole complete and up to date. We have under 
turquoise a good account of Schaller’s recent work on the specimens 
found in Virginia, which cleared up the mystery of the crystallization 
of that species and showed it to be isomorphous with chalcosiderite. 
Following the chapters on monazite and xenotime comes an 
interesting one on the commercial use of the so-called rare earths. 
We have noticed one important omission. In the section on tilasite, 
the calcium-magnesium arsenate, no reference is made to the memoir 
published by Prior & Smith in the Mineralogical Magazine in 1911 on 
the crystals found by Ferrar in the manganese-ore deposits of Central 
India. In consequence the crystallographical particulars of the 
mineral are reduced to the single—erroneous—sentence: ‘‘Kristallisiert 
vielleicht triklin”; the crystals, however, actually belong to the 
clinohedral class of the monoclinic system. 
XIJ.—Russtaw Merrorrre.—In the Proceedings of the U.S. National 
Museum (vol. xlix, pp. 109-12, with plate xxxvii) Mr. George 
P. Merrill briefly describes the meteoric stone which fell at Indarch 
in Russia on April 7, or possibly April 9, 1891. It is a dark 
greenish-grey in colour, firm and compact in texture, and thickly 
studded with small, dark-green chondrules and nodular masses of 
metal and troilite, rarely more than 1 mm. in diameter. Graphite is 
very prevalent. Oldhamite, calcium sulphide, occurs sometimes 
interstitial and sometimes enclosed in enstatite; it is yellow-brown, 
sometimes greenish, in colour, and completely isotropic. The 
presence of carbonic acid in the analysis suggested breunnerite, but 
the actual occurrence could not be determined. The stone is 
a carbonaceous chondrite (Ke). 
XIII.—Brisr Noricers. 
1. QurnevenniAL Review oF tHE Minera Propuction oF Inpra. 
By Sir T. H. Hortanp and Dr. L. L. Fermor. Revised for the 
years 1909 to 1918 by Dr. H. H. Haypen and Dr. L. L. Frrmor. 
Records Geological Survey of India, vol. xlvi, 1915. 
This valuable report contains a great deal of useful information 
regarding the occurrence of economic minerals in India. Listed 
according to their values the eight principal minerals are coal 
(£3,800,000 in 1913), gold, petroleum, manganese ore (about 
40 per cent of the world’s production, and exceeded only by Russia), 
salt and saltpetre, mica (65 per cent of world’s production), and lead 
ores. During the period under review the tin and wolfram 
industries in Lower Burma have made considerable strides, while 
rubies and other precious stones have suffered some depression. The 
