AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.,] 
ArT. XXIX.—On the Mineral Locality at Branchville, Connee- 
ticut: Fourth Paper.* Spodumene and the results of its 
Alteration ;+ by George J. BrusH and Epwarp S. Dana 
(With Plate 1 IV). 
N the present paper we give the results hi have obtained 
ina (iy of the spodumene from Branchville, Conn., and of 
the various minerals derived from its penn Iti is, after 
the feldspars, mica and quartz, the most important of the orig- 
inal minerals of the locality, and occurs, though mostly in an 
altered condition, in very large quantities. 
* For Tr previous papers upon this eg see this Journal, III, xvi, 33, 114, 
1878; xvii, 359, 1879; xviii, 45, 1879 
ed and valuable memoir upon ‘ nicgrereages 8 and its alterations from 
© granite veins of Hampshire Co., Mass.,” has been recently published by Mr. 
A. A. Julien in the Annala of the New York Academy of Sciences, Vol. i, No. x 
(see this Journal, xix, 237, March, ec Pe is proper that we should state here 
that most of the results of this paper, including every had — 
pleted previous to the appearance of that of Mr. Julien, and when we had no 
eo) 
results, apts ct arrived at independently and based upon material from a 
ditferent so source, i cases confirm those of Mr. Julien, and this, as we believe, 
~_ much to to the i “bora. "of t the whole subject. Our conclusions, however, differ 
spects. W i 
Am. Jour. ideas —- Vou. xx, ie. 118.—OocrT., 1880, 
