REVIEWS 



The Tin Resources of the British Empire. By N. M. Penzer. 

 London: WilKam Rider & Son, Limited, 192 1. 



This book constitutes a useful reference work for geologists, mining 

 engineers, and others who are in search of information on specific tin- 

 producing districts in the British Empire. The book contains volumi- 

 nous statistical tables recording the trade in tin within the British Empire 

 and production statistics where such are available. For the Cornwall 

 district production tables for individual mines are given. 



As the book does not profess to be primarily geologic there are no 

 geologic maps and the geologic descriptions are commonly short; two 

 geologic sections across the Malay Peninsula prepared by J. B. Scrivenor, 

 Government Geologist of Malaya, are, however, included. 



Methods of prospecting, mining, and ore treatment are discussed for 

 certain regions, notably Malaya, The book closes with brief chapters 

 on the "Industrial Applications of Tin," "Prices, Sale of Tin," and 

 "World's Output," and with a Bibliography of forty pages in which the 

 titles are listed geographically with the exception of those which are 

 general in their scope. To the geologist this Bibliography will be found 

 to be less exhaustive and less useful than that compiled by F. A. and 

 Eva Hess, pubhshed as Vol. LVIII, No. 2, of the Smithsonian Mis- 

 cellaneous Collections. E. S. B. 



Determinative Mineralogy. By J. Volney Lewis. Third edition. 

 New York: John Wiley & Sons, 192 1. $3.00. 

 In this new edition Professor Lewis has followed the general plan 

 of the second edition, so far as the blowpipe work and the chemical 

 properties of minerals are concerned. On these points, therefore, the 

 new edition needs no comment, although minor changes, such as the 

 omission of some twenty-five of the rarer minerals and the use of a 

 larger-size page, may be mentioned. The addition of determinative 

 tables for some 290 minerals, covering 138 pages, based purely on 

 physical characteristics, is an innovation of great value which will com- 

 mend itself both to those who use the book in the field, and those who 

 use it in the classroom. 



