VERMONT AND WESTERN MASSACHUSETTS. 



451 



(Am. 



and chloritic rocks) as forming parts of one ancient crystalline series, whicli is 

 largely developed in the vicinity of Boston, and may be traced at intervals 

 from Newport to the Bay of Fundy, and beyond. To this same oeries I reier 

 the great range of gneissic anddioritic rocks with serpentines, chloritic, talcose 

 and epidotic schists which stretches through western New England." (L c , 

 October 19, 1870, XIV., p. 46.) 



The references to the American Journal are to a paper stated to have 



been read before the American Association, August 20, 1870, a year 



before the Presidential Address, and which was published in the 



Canadian Naturalist some eight months before that address was de- 

 livered. 



He says, in the first reference to the rocks above referred to in the 

 Proceedings of the Boston Society : 



" They apparently belong .... to the great Iluronian series." 

 Jour. Sci., February, 1871, (3) I., p. 84.) 



The second reference reads as follows : 



" The rocks of this White Mountain series are, in the present state of our 



knowledge, supposed to be newer than the Iluronian system . . . ., to which, 



with Macfarlane and Credner^ I refer the crystalline schists with associated 



serpentines and diorites of the Green Mountains." (Am. Jour. Sci., 1871 



(3) I., p. 182; Chemical Essays, p. 194 j Canadian Naturalist, 1870, (2) Y., 

 p. 396.) 



In Dr. Hunt's Azoic Books (pp. 222-224) is given part of a letter to 

 Major T. B. Brooks, under date of February 22, 1871, nearly five 

 months before the Indianapolis address. Since this letter is given in 

 full in the Geology of Wisconsin, Vol. III., 1879, pp. 657-6G0, we pre- 

 fer to take our extracts from that : — 



" You remark about the mica^schists as being supposed by me wanting in 

 the Iluronian of Canada, and you send me Nos. 1215, 1154, 1152, 1153 Now 

 I have for some time past recognized a mica^schist series which I sui)posed to 

 Qverbe the Iluronian, in fact the White Mountam scries, provisionallv named 

 by me Terrauovan [and since called Montalban]. See Am. Jour, Jufy, 1870, 

 I was therefore delighted to find in the specimens named well-characterized 

 White Mountain mica-schists, holding garnets and well defined crystals of 

 Staurohte [U53] ; Avhile tlie peculiarly knotted mica schist is not less charac- 

 teristic. ^ These rocks are abundantly spread to the north of Lake Superior, as 

 last year's collection show me ; but altliougli I have not there been able to fix 

 their relation to the Huronian diorites, talcose schists, iron ores, etc., I con- 

 clude, from the facts seen near Portland in Maine, and those described by 

 Kogers in Pcnn., they are overlying rocks, and in some cases at least un- 

 conformablv so. You say that * they are the youngest rocks in the region 



