Reviews — Vredenburg's Summary of the Geology of India. 181 



of £2,363,457. The other contributions are scarcely woi-th noticing, 

 except that in 1905 the river dredgings in Burma yielded a value 

 of £2,712, which may be the firstfruits of a paying industry. In 

 consequence of frequent applications for licences to work the alluvial 

 deposits in Upper Burma Mr. J. M. Maelaren was deputed, during 

 the field season of 1905-6, to report on the work in progress on the 

 concessions already granted, and generally on the conditions for alluvial 

 gold-dredging in the rivers of Upper Burma. Mr. Latouche's report 

 on the gold of the Loi-Twang area is not very encouraging. Excluding 

 a small nugget, the value per cube yard in the richest gravel met 

 with was not much more than two grains. The financial aspect of 

 Mr. Maclaren's report is confidential, but we owe to his journey an 

 interesting note and map on "The course of the Upper Irawadi " 

 (^GeoffraphicalJounial, November, 1907) when examining the auriferous 

 alluvial deposits of that and other rivers. 



Iron-ores. — The production of iron from its ores in India is still very 

 limited, and according to the statistics supplied by Mr. Latouche the 

 value is even less in 1905 than in 1903, or at least seems to be. 

 Anyhow, the value in 1905 is returned as only £13,827. And yet 

 Mr. Holland announces the discovery of something very like an iron- 

 mountain, whose ores were intended to be used in some future works 

 on the Bengal-Nagpur Railway. The ordinary quartz iron-ore schists 

 of the Dharwars occur in this locality ; but the same schists appear 

 to have been altered locally by intrusive igneous rocks, with the 

 segregation of large bodies of almost pure haematite. 



Manganese-ore and Mica. — These in point of production more than 

 hold their own. As regards the amount of manganese-ore, this rose 

 from 150,297 tons in 1904 to 253,896 in 1905. The value of this 

 ore Mr. Latouche (p. 57) puts at £82,979, whereas in the table 

 (p. 47) the export value appears to be £248,309. This difference in 

 valuation is so great as to call for some explanation. 



W. H. H. 



III. A SUMMAKY OF THE GeOLOGY OF InDIA. By ErNEST "W. 



Veedenburg, A.R.S.M., A.B.C.S., of the Geological Survey of 

 India. Small 8vo ; pp. 67, with table of formations. (Calcutta : 

 Thacker, Spink, & Co., 1907.) 



rpmS is an extremely useful little book, and should be of great 

 1 service to travellers in India desirous of obtaining a succinct 

 account of the geology of that country in its tripartite division. 

 According to this author the geological formations of India may be 

 classified as follows : — 



Recent formations. 



Pleistocene. 



Siwalik System (Pliocene and Upper Miocene). 



Pegu or Mekran System (Lower Miocene and Oligocene). 



Eocene. 



Mesozoic or Secondary. 



Permian and Upper Carboniferous. 



