Pape fe ce ee ge Ne 
J. L. Smith on the Emery mine of Chester, Mass. 85 
to be margarite, and from that I ventured to predict t the occur- 
rence of emery, but ri attention was paid to this prediction by 
the owners of the mine, who were more intent on the iron ore. 
A few weeks since, pn Dr. Lucas, one of the owners, resident 
in Chester, and called him into my office, and explained to him 
the great value of emery, and told him how to detect it, and he 
promised to make the search I required, and took exact direc- 
tions from me.” 
margarite ‘ee this appears to be identical) as an associate of 
emery, and also as an interesting case of deduction heat scientific 
memoirs.’ 
Accompanying the letter he sent me a paper giving mea sum- 
mary of a communication he had made to the Boston Society of 
Natural History on the subject, concluding by remarking that 
‘had not the occurrence of emerylite and chloritoid called his 
attention to the probable existence of emery at this loéality; it 
would have been a to this day, and no one knows how 
much longer. e fact was mentioned as an —- of the 
real uses of supposed useless minerals; and the Doc k 
sion to express his oe to Dr. Smith, of Lodiveiiia for his 
iate eme 
valuable contributions to our knowledge of the 
minerals of the es Archipelago and Asia Mises ¢ 
These statements are ient to show how far my geological 
observations served de to Prof. C. T. Jackson, in his de- 
I have since visited the locality, having done so in the month 
of March last. The geological character and position of the 
rocks was not as well made out by me as might have been done 
in a more favorable season; but as my observations accord, as 
far as they go, with those of Dr. Jackson and Prof. Shepard, I 
prefer inserting their observations, rather than my own, in de- 
scribing the geology of the emery ‘localit ity. 
“The mine is situated nearly in the center of the Green Moun- 
tain chain as it traverses the western border of the state, at a 
7 pene not far from half way between the Connecticut and Hud- 
rocks, 
It is included in the metamorphic series of 
consisting of vast breadths of gneiss and mica-slate, with 
considerable interpolations of talcose slate and serpentine. The 
general direction of the stratification is N. 20° E. and S. 20° W., 
the relation to the horizon varying from vertical, to a dip of from 
75° to 80°, sometimes east, sometimes west. 
