REVIEWS 66 J 



Mountains shows that there is no evidence in this region in favor of the 

 theory of considerable absorption. 



J. P. I. 



Geological Survey of Ca?iada. Annual Report of Mineral Statis- 

 tics for i8q8. By E. D. Ingall, Ottawa, 1890. 196 pp. 



This report shows an increase of total production for the year 

 covered of 34.89 per cent., a production per capita of $7.32. This is 

 compared with a total increase for the United States of 10.61 per 

 cent., and a per capita production of $9.38, the source of the latter 

 statistics not being given. Compared with previous years, there is a 

 steady and large increase. From a table of proportionate values it 

 appears that gold produces more than one-third (35.63 per cent.) of 

 the whole, leaving coal (21.27 P er cent.) well in the rear, while the 

 next on the list are silver (6.71 per cent.) and copper (5.52 per cent.) 

 In the preceding year coal had stood at the head of the list, the 

 change of places being due to the large output of gold from the 

 Yukon. 



The total estimated value of metallic and non-metallic products 

 is $38,661,000. The numerous tables usually give the production 

 for several years previous, and afford the means for comparative 

 studies. 



C. 



On the Subdivisions of the Carboniferous System in Eastern Ca?iada, 

 with Special Reference to the Union and Riversdale Formations 

 of Nova Scotia, Referred to the Devojnan System by Some 

 Canadian Geologists. By H. M. Ami, Trans. N. S. Inst. Sci., 

 Vol. X, Session 1899-1900, 17 pp. 



The precise scope of the paper is well indicated in the title. The 

 argument proceeds essentially on paleontological lines, and the 

 physical lines of evidence are essentially set aside. In this case these 

 latter embrace unconformities as well as the character' of the rocks. 

 The paleontologic evidence embraces plants, crustaceans, insects, 

 mollusks, and amphibia. These are thought to indicate an Eo-Carbon- 

 iferous age for the Union and Riversdale formations, which have been 

 referred by some Canadian geologists to the Devonian system. The 



