REVIEWS 285 
is nearly stationary or is decreasing, except in the case of coal. About 
six and one-half million tons of coal were mined in roto, as against four 
and three-quarter million tons in 1909. lala Gan Ce 
Annual Report of the Bureau of Mines, Ontario. Vol. XX, Part 1, 
HOLie ips 2645 hes. 30;--pls. 11; maps 4: 
The mineral production of Ontario for 1910 is reviewed, and com- 
pared with the productions for the past five years. Most noteworthy 
is the great increase in the amount of silver mined in the Cobalt dis- 
trict, an increase of over $3,000,000 above that of the previous year. 
This raises the production from these mines to over $15,000,000 for 
tg10, and places Canada third in rank among the silver-producing 
countries of the world. The value of the nickel from the Sudbury mines 
also reaches over $4,000,000 in 1910, an increase of more than $1,200,000 
above the previous year. 
The remainder of the report contains the following papers: ‘‘ Mining 
Accidents,” by E. T. Corkill, pp. 59-85; “‘Mines of Ontario,” by 
E. T. Corkill, pp. 86-118; “Silver in the Thunder Bay District,’’ by 
N. L. Bowen, pp. 119-32; “‘The Sturgeon Lake Gold Field,” by E. S. 
Moore, pp. 133-57; “Gold Fields of Lake of the Woods, Manitou, and 
Dryden,” by A. L. Parsons, pp. 158-98; ‘Vermilion Lake Pyrite 
Deposits,” by E. S. Moore, pp. 199-213; “Iron and Lignite in the 
Mattagami Basin,” by M. B. Baker, pp. 214-46; “Notes on the Salt 
Industry of Ontario,” by N. L. Bowen, pp. 247-58; “‘A Geological Trip 
in Scotland,” by W. G. Miller, pp. 259-69; “The Mining Law of Onta- 
HOw Vos ETice, pp. 270-703, ) Lhe Laurentian, System,”’ by W. G. 
Miller and C. W. Knight, pp. 280-84. Ee Ca; 
Notes on the Geology of the Swedish Magnetites. By D.H. NEWLAND. 
New York State Museum Bulletin 149, Pp. 107-109. 
The author describes the nature, occurrence, and genesis of the 
principal magnetite deposits of Sweden, viewed while attending the 
International Geologic Congress at Stockholm in 1910, and compares 
them as far as possible with similar American deposits. While mention- 
ing the bog-iron deposits and the low-phosphorous magnetites, he takes 
up in particular detail the great deposits of high-phosphorous magnetites 
at Kiruna and Gellivare. These ores occur in lenses, bands, and chim- 
neys, as magmatic segregations from quartz porphyries and sodic syenites. 
The Kiruna ores are massive and non-granular, having been subjected 
