Geology. 239 



an account of the Quantitative Classification, and a discussion 

 and list of lnaginatic normative names, closes the volume. It is 

 well indexed by several methods, so that analyses may be 

 readily found. 



The search for the material through the literature, its colla- 

 tion, the calculation of the norms, the preparation of the manu- 

 script and the proof reading of this work, evince the expenditure 

 of a vast amount of time and a patient industry in the per- 

 formance of a great and tiresome task for which those who use 

 the volume can feel only admiration and gratitude. Its appear- 

 ance may be said to mark an epoch in chemical petrology. 



L. v. P. 



2 Nickel Deposits of the World; by Willet G. Miller and 

 Cyril W. Knight. Eeprinted from the Eeport of the Eoyal 

 Ontario Nickel Commission, 1917. Toronto. Pp. 285, with 

 many illustrations, diagrams, maps, plans, etc. — This book 

 presents, after a general introduction concerning the ores of 

 nickel, etc., a complete and detailed account of the nickel deposits 

 of the Sudbury, Ontario, district. This includes a description 

 of the geology, the theories as to the origin of the ores and 

 descriptions with plans and diagrams of the different important 

 ore bodies. A section is also devoted to the Sudbury methods 

 of mining. In the latter part of the book the nickel deposits 

 found elsewhere in the world are more briefly described, the 

 important deposit in New Caledonia being treated however at 

 some length. The volume will become an important reference 

 book concerning the past and present conditions of the nickel 

 mining industry. w. E. p. 



3. Annual Report of the Board of Scientific Advice for India 

 for the year 1915-16. Pp. 204. Calcutta, 1917.— The Board of 

 Scientific Advice for India includes eleven gentlemen, with Mr. 

 E. A. Mant, Secretary to the Government, as ex-officio president. 

 There are six sub-committees and the subjects treated briefly in 

 this, as in earlier, volumes of the series, extend over the entire 

 range of science from chemistry to medicine. The great variety 

 of topics discussed, and the economic importance of many of 

 them, gives the volume an especial interest. This is perhaps 

 especially true in geology, where the director of the Geological 

 Survey, Dr. H. H. Hayden, gives some important notes in regard 

 to the occurrence of metals particularly valuable under existing 

 conditions. In mineralogy, an analysis may be noted by A. K. 

 Banerji of the highly pleochroic manganese variety of pyroxene 

 named blandfordite (1906). The specimen analyzed came from 

 the Kachi Dhana mine and the results obtained are here noted : 

 SiO., 52.18, Fe„0 3 20.26, A1 2 3 5.89, MnO 3.60, CaO 4.37, MgO 

 3.25, Na.,0 10.12 = 99.57. 



