Geology and Natural History. 303 
cal with existing species now living in the State, excepting Feliz 
occulta, which has not been found living north of Arkansas 
Prof. Cox states that he is unable to find any ground for subdi- 
viding the coal formation into parts corresponding to separate 
epochs, e observes that there are two well defined zones of 
t 
ern is about 450 square miles; and the coals are of the free-burn- 
e 
quarter millions of tons. e coal from this zone has received 
the name of Block-Coal on account of readily coming out in large 
blocks when mined. It breaks into thin sheets parallel with the 
bedding, but with difficulty in the opposite direction. The coal is 
remarkably free from sulphur and phosphorus, and is coming rap- 
idly into use for the manufacture of Bessemer steel. : 
e western zone covers full 6,000 square miles, and contains 
a or more thick beds of good coal, which are in eneral caking- 
coals, 
a2 Report closes with a list of the Plants of the State, by A. 
8: : 
6. Mines, Mills and Furnaces of the Pacific States and Terri- 
tories ; by Rossrrer W. Raymonp, Ph.D., United States Com- 
missioner of Mining Statistics. 8vo, pp. 556. New York: J. 
the usual chapters of statistics of the vemaagr ss of the precious 
Metals, this volume, like those which have — it, gives a 
Sources and methods of the mining and me llurgical industry in 
California, Nevada, Montana, Arizona, and other important min- 
ingregions, We find, also, chapters upon metallurgical processes, 
