VERMONT AND WESTERN MASSACHUSETTS. 451 



and chloritic rocks) as forming parts of one ancient crystalline series, which 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 series I refer 

 the great range of gneissic and dioritic rocks with serpentines, chloritic, talcose 

 and epidotic schists which stretches through western New England." (/. 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 Huronian series." (Am. 

 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 Huronian 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; Canadian Naturalist, 1870, (2) V., 

 p. 396.) 



In Dr. Hunt's Azoic Rocks (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-sckists as being supposed by me wantin» in 

 the Huronian 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 supposed to 

 overlie the Huronian, in fact the TFhite Mountain series, provisionally named 

 by me Terranovan [and since cjiUed Montalban]. See Am. Jour., July, 1870. 

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

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

 StEiurolite [1153]; while the 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 although 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 

 Rogers in Penn., they are overlying rocks, and in .some ca-^es at least un- 

 conformably so. You say that ' they are the youngest rocks in the region 



