812 GEOLOGY OF OLD HAMPSHIEE GOUIS^TY, MASS. 



their abundant minerals), the notion that any considei'able portion of the 

 pegmatite is "endogenous" — i. e., is a granite veinstone of aqueous origin — 

 is met by its enormoiis amount in comparison with the schists from which 

 it is supposed to be derived, and the fact that it has phiinly conduced to the 

 em-ichment of the schists by rendering them feldspathic and abundantly 

 quartz-veined rather than to their impovei'ishment. At the same time, the 

 appearance of the granites solely in the mica-schist area is a fact for which 

 I have no explanation, except that the granites have come up along the 

 axes of the larger synclines. 



HISTORICAr, XOTES OIV TIIE 3IICA-GRAXITES. 



1819. E. Hltclicock. Geology of Deerfield, etc. Am. Jour. Sci., 1st series, vol. 1, 



p. 100. 



1820. A. Eaton. Index, p. 'J3. 



1823. E.Hitchcock. Geology of the Connecticnt River. Am. Jour. Sci., 1st series, 



vol. 6, p. 18. 



1821. 0. Dewey. Geology of Berkshire County, etc. Ibid., vol. 8, p. 4. 



1824. E. Emmons. Notice of localities. Ibid., p. 250. 



1827. A. Nash. Lead mines of Hampshire County. Ibid., vol. 12, pp. 238-258. 



1828. E. Hitchcock. Mineral localities. Ibid., vol. 14, p. 219. 

 1833. E. Hitchcock. Geology of Massachusetts, p. 465. 

 1835. E. Hitchco(;k. Ibid., No. 17, p. 473. 



1841. E. Hitchcock. Ibid., Final Report, p. 682. 

 1855. E. Emmons. American Geology, p. 64. 

 186G. C. U. Shepard. Am. Jour. Sci., 2d series, vol. 42, p. 248. 

 1870. W. O. Crosby. Report on Geological Map of Massachusetts, pp. 30, 38. 

 1879. A. A. Julien. Spodumene and its alterations. Annals N. Y. Acad. Sci., vol. 1, 

 p. 346. 



In 1819^ President Hitchcock mentions the granite as extending from 

 Southampton to Hatfield, with veins of lead ore — not distinguishing the 

 Hatfield "syenite." 



In 1820 Eaton uses the term "the Northampton Range," and notes 

 the direction and extent of the lead vein from Montgomery to Leverett as 

 proof of the continuity of the above range of granite. He also notes the 

 three granite veins, with tourmaline, in Goshen and Chesterfield. 



In 1823 President Hitchcock designates the granitic area extending 



'The year uumber may serve as reference number to the article cited above. 



