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probable ore, 37,000,000 metric tons, in addition to this amount. Low- 
grade ore, high in silica but of possible economic importance, 4,000,000 
metric tons. A table of about 175 analyses of ores from various locations 
is added. 
A: D. B. 
The Iron Ore of Corea. By Kinosuxe Inouye. “Iron Ore 
Resources of the World.’ Stockholm, 1910. Pp. 973-81; 
Plate 1. 
Three types of deposits have been recognized, namely magmatic 
segregations, bedded deposits, and contact deposits, but little is known 
regarding the occurrence of the ores. The present output is about 
70,000 metric tons per year, mostly limonite, with some hematite and 
magnetite. In one district a rough calculation gives 4,000,000 metric 
tons above level ground, but for the rest of Corea data are lacking. The 
producing mines are briefly described and a number of analyses are 
inserted. The iron content varies from 29 per cent in one of the contact 
ores to 70 per cent in one of the magnetite ores. 
Ie\y Ds, 38}, 
Building Stones. By JoHN Watson. Cambridge, 1911. Pp. 483. 
This is a descriptive catalogue of the specimens of British and 
foreign building stones in the Sedgwick Museum, Cambridge, England. 
The rocks are grouped according to origin as igneous plutonic, igneous 
volcanic, metamorphic, and sedimentary. The sedimentary rocks are 
subdivided according to their geologic age. Under each of these divisions 
the rocks are taken up by countries and about half of the book is devoted 
to their occurrence, texture, and uses. The remainder of the book is 
the catalogue proper, giving the name and location of specimens by 
number. Brief notes as to color and texture, and in most cases chemical 
analyses and crushing tests are added. 
Fa\y 10), 183, 
