376 Reviews — Geological Society's Library. 



sections afiord many opportunities for discussing the methods by 

 which the overlying strata are invaded. The phenomena observed 

 are found to corroborate the theory of " overhead stoping " advanced 

 by Daly. 



Mem'oir 25. Report on the Clay and Shale Deposits of the Western 

 Frovinces. By A. Ries and J". Keele. pp. 99, with 6 figures in the 

 text and 40 plates. 1913.— The first report on this subject was 

 published as Memoir 24 E. The present memoir is devoted almost 

 entirely to technical detail ; it shows the extension of several useful 

 types of clay discussed in the earlier publication. 

 " Memoir 26. Geology and Mineral Deposits of the Tulameen District, 

 British Columbia. By C. Camsell. pp. 188, with 2 figures in the 

 text, 23 plates, and 4 maps. 1913. — This memoir contains some 

 interesting petrography dealing with igneous rocks of Jurassic and 

 of Tertiary age, one notable point being the discovery that the Otter 

 granite, a large batholithic mass, is of post-Oligocene age. The 

 occurrence of platinum in this district has been discussed by 

 Professor J. F. Kemp, whose results have been confirmed by recent 

 observations. The most valuable scientific discovery is that of 

 diamonds occurring in chromite segregations in a peridotite. This is 

 discussed more fully in a separate brief notice above (see p. 375). 



Memoir 30. l%e Basins of Nelson and Churchill Rivers. By 

 W. Mclnnes. pp. 146, with 19 plates. 1913. — The area dealt with in 

 this memoir lies between the Saskatchewan Biver and Hudson Bay, 

 a district which has been traversed by traders and explorers since 

 1697. Part of the region was explored by Sir John Fi-anklin's first 

 expedition in 1819-21. The memoir embodies the work of several 

 officers of the Geological Survey between 1877 and 1910. The 

 general geology deals with the early pre-Cambrian rocks, which form 

 the central complex of the region, and with the overlying sedimentary 

 beds, which range from Upper Huronian to Upper Cretaceous. 

 Detailed descriptions are given of the rivers and lakes. Large areas 

 are covered by lacustrine clays belonging to the age of the declining 

 glaciers, some of these occupying an extension of the glacial Lake 

 Agassiz described by Upham in 1888. 



Memoir 37. Portions of the Atlin District, British Columhia. 

 By D. D. Cairnes. — This is the subject of an earlier notice in this 

 journal (1914, p. 129). 



Memoir 44. Clay and Shale Deposits of New Brunswich. By 

 J. Keele. pp. 94, with 7 figures in the text, 16 plates, and 1 map. 

 1914. — In addition to much useful technical information this memoir 

 contains a brief discussion of the origin of clays and shales which will 

 serve as a useful introduction to those interested in the subject. 



VI. — Geological Liteeatxjee added to the Geological Society's 

 Library during the tear ended December 31, 1912. 8vo; 

 pp. 268. London: Geological Society, 1914. Price 2s. 



rpmS invaluable publication has now reached its nineteenth year. 

 _L It is somewhat late, owing to the change of Librarians and 

 consequent dislocation of business entailed, and it is more bulky 



