2 acres, occupies the eastern extremity of the shelf. Between 

 these lie the two other ponds each less than half an acre in extent. 

 The outlets of these ponds join sooner or later and empty as 

 a common stream into the Middle Wissattaquoik some four miles 

 down the valley. Rising up from, and occupying a large part of, 

 the shelf are two roches moutonnecs which with their flat tops 

 and precipitous sides bespeak unmistakably a glacial origin. 



The mountain then as an entirety is a long (9 miles), narrow, 

 fish-hook-shaped, serrated crest, bristling with peaks and divided 

 by the low Central mountain, the "saddle," into the North and 

 South mountains from which jut out spurs in all directions, 

 enclosing several well defined basins and preventing every 

 conceivable exposure. A multitude of local conditions which 

 largely determine the development of the varied plant physiog- 

 nomy of these slopes is thus produced. 



III. THE GEOLOGY. 



The entire mountain from the lowest point in which rock has 

 been found in situ is, as noted above, composed of granite. Two 

 varieties are very evident, especially so in the great basin ; a gray, 

 which composes the lower two-thirds of the basin walls, and a 

 red, out of which the East and West peaks, Pomola, the Chim- 

 ney, the North peaks, and the serrated crest are formed. This 

 line of demarkation is not one of general distinctness, yet the 

 main fact, as outlined above, still holds. From analyses 1 made 

 by Dr. Wadsworth of Harvard, I take an example of each of the 

 varieties : 



1. Hamlin, C. E. Op. cit. 



No. 3. A gray granite, composed of feldspar, quartz, and 

 biotite. The feldspar is of two kinds : a grayish-white variety 

 with a pinkish tinge, is the most abundant, while subordinate 

 to it occurs a milk-white striated feldspar. The powder of the 

 rock is magnetic. Microscopic examination shows it to be com- 

 posed of orthoclase, much decomposed, and plagioclase, slightly 

 altered, quartz, biotite, and magnetite. This gray variety is gen- 

 erally very solid and occurs but rarely in process of disintegra- 

 tion. 



No. 23. A brownish red granite of similar composition with 

 the preceding. Feldspars colored pink and greenish white. 



