758 REVIEWS 



This seismic history covers the period from 1810 to 1905. The 

 second volume, which is now in press, will treat the much more inter- 

 esting earthquake of southern Peru, Bolivia, and northern Chile. Seis- 

 mologists will rather generally regret that it was necessary to print the 

 results in the Spanish language. 



W. H. H. 



"The Production of Phosphate Rock in 1910." By F. B. Van 

 Horn. Advance chapter from Mineral Resources of the United 

 States for 1910, U.S. Geol. Survey, Washington, 191 1. 



The total production of phosphate rock in 19 10 showed an increase 

 of a little over 10 per cent over the 1909 production. The increase 

 came notably from Florida, with small increase from Tennessee and the 

 western fields, and a drop in production from North Carolina. A drop 

 of fifty-one cents per ton in the average price brought the increase in 

 value down to a little over 1 per cent. Florida is as before by far the 

 largest producer, giving 77.9 per cent of the total for 1910. A short 

 chapter on methods of mining phosphate rock in the various fields is 

 inserted. 



A. D. B. 



"The Manufacture of Coke in 1910." By Edward W. Parker. 



Advance chapter from Mineral Resources of the United States 



for 1910, U.S. Geol. Survey, Washington, 191 1. 



The coke output of the United States in 1910 broke the record of 



1907 by nearly a million tons but by no means reached the 1907 record 



for value. Compared with 1909 the amount increased 6.1 per cent 



and the value 10.9 per cent. Illinois rose from fifth to fourth rank 



owing to the installation of ovens at Joliet by the United States Steel 



Corporation, but in general the rank of producing states changed little. 



In 1910, 17.12 per cent of the output was from by-products ovens, 



against 15.94 per cent in 1909. 



In spite of the increased production and higher price of coke, 1910 

 was not a satisfactory year from the producer's standpoint. The 

 increased value of the coal charged into the ovens more than offset the 

 increase in price of coke. A downward tendency in price held through- 

 out, with the result that before the end of the year some manufacturers 

 were running at a loss. 



A. D. B. 



