36 Revieics — Dr. G. Lind stromas Silurian Gasteropoda, etc. 



The copper-bearing shales of Mansfield, in Prussian Saxony, are 

 described, as illustrating sedimentary beds in which ores have been 

 chemically deposited. 



We next pass to the ore-deposits met with in unstratified rocks 

 which, with the exception of iron and manganese, yield by far the 

 larger proportion of the metalliferous minerals. 



The nature of true veins and all the varieties which they present, 

 and their behaviour and distribution, occupies a very considerable 

 space, and is well illustrated by numerous woodcuts. 



This concludes Part I. and the first 108 pages of the book. 



Part JI., which occupies 516 pages, is devoted to a description of 

 the Ore-deposits of the Principal Mining Regions, and so with Mr. 

 Phillips for our guide we traverse England, France, Belgium, 

 Germany, Italy, Greece, Spain, Portugal, Sweden, and Russia. Still, 

 with untiring energy, we investigate the mineral resources of Asia, 

 and then set sail with our guide for Oceania, visiting the Dutch 

 East Indies, Japan, and the Australasian colonies ; then turning to 

 Africa, we find mining in a more backward state in the dark conti- 

 nent than elsewhere, although the prospects of the future for the 

 Transvaal gold fields may perhaps be hopeful. 



In Namaqualand, mining for copper ore seems to promise good 

 returns. 



The Two Amei'icas naturally demand and receive a fair share of 

 attention, having more than 100 pp. devoted to their ore-deposits. 



The influence exercised of late years on our currency by the 

 enormous output of silver in North America is evidenced by the table 

 given at p. 557, where the weight and value of the precious metals 

 j)roduced in the United States alone, for the year ending 31 May, 

 1880, shows :— 



Gold iu ounces 1,614,741 



Silver „ 31,797,474 



Having a total value of £14,898,124 Os. Ocl. 



The former of which would represent about £b', 620, 438 Os. Qd. 



Whilst the latter would amount to about £8,277,686 Os. M. 



Space does not permit us to give a fuller notice of Mr. John Arthur 

 Phillips' most useful volume, although its merits deserve it. The 

 book is provided with an excellent index, and, he who mines may 

 read, and we are sure he will find this volume a most valuable and 

 instructive guide in whatever part of the globe his lot may be cast. 



IV. — On the Silurian Gasteropoda and Pteropoda of Gotland. 

 By G. Lindstrom. With 21 Plates. Communicated to the 

 Royal Swedish Academy of Sciences, June 8th, 1881, and April 

 9th, 1884. Kongl. Svenska Vetenskaps-Akademiens Handlingar, 

 Bandet 19, No. 6. 4to. pp. 250. Price 16s. (Stockholm, 

 1884 : P. A. Norstedt & Soner ; London, Triibner & Co.) 



PROFESSOR LINDSTROM, so favourably known as an authority 

 on Silurian and Devonian Corals, has turned his attention to 

 the fossil Mollusca of the Isle of Gotland, and this splendid mono- 



