Limonite ore-beds of the Limestone region. 189 
the regions will be good for iron ore long after the limonite 
beds are exhausted. 
(To be continued.) 
Nore.— Professor Dewey’s determination, by chemical means, 
that the Taconie “ talcose slate” es jan slate” of Emmons) is 
a 
mica slate 
us 
Species ; and on page 366 of vol. iv pie the analyses published 
in the Vermont Report are cited. 
Dewey, who in early life worked in chemistry as well as in geol- 
°8y, mineralogy and botany, to state that in the jirst volume of 
this Journal, published in 1819, in an article on the geology of 
* Analyses of the same ores, from similar positions, in Pennsylvania in Frazer's 
Geological Report, Harrisburg, 1876. : 
