MUSEUM OF COMPARATIVE ZOOLOGY. 29 



Although the boulders have now been removed from the last locality 

 to improve the land for agricultural purposes, there is reliable verbal 

 evidence to show that they formerly existed there in abundance. 



In the above table the localities are arranged in the order of the 

 abiuidance in which they afford boulders, and by reference to the map 

 it may be seen that they are thus at the same time in very nearly the 

 order of their distance from Fry's Hill. By an estimate made as care- 

 fully as possible, the number of boulders in this train on the eastern 

 slope of the Canaan and Lebanon Range appears to be about ten times 

 as great as that on the same area in the Cook Valley. 



4. Size of Boulders. — By far the largest boulders of this train are to 

 be found on the eastern slope of the Canaan and Lebanon llange, two 

 of them measuring 90 and 125 feet respectively in circumference, and 

 being 30 feet in height. As close a calculation as can well be made 

 gives the average length of the blocks in this vicinity as about 15 feet. 



In the vicinity of Canaan Shakers the boulders average perhaps 12 

 feet in length, one on the east side of the road, between the North and 

 South Families, having a circumference of 75 feet. 



Two miles north of Richmond Station the boulders are of great size, 

 two, mentioned by Sir Charles Lyell and other writers, being respectively 

 70 and 120 feet in circumference, the latter having, above the soil, a 

 height of 20 feet. 



Passing along the train as it crosses the Richmond Valley and the 

 Lenox Range, a constant diminution in the size of the boulders takes 

 place, till in the Lenox and Stockbridge Valley the average length is not 

 over two feet. 



5. Shaj^e of Boulders. — The shape of the chloritic schist boulders is 

 wholly irregular, and they are usually little modified by abrasion. None 

 of those lying upon the surface are polished, though in the Lenox and 

 Stockbridge Valley they are somewhat less angular than at the source 

 nine miles distant. 



h. Second Train. 

 About half a mile to the southwest of the train just described lies 

 another, composed of the same kind of rock, but lacking the perfection 

 and continuity of the first. The most westerly of the detached groups 

 of boulders of which this train is composed, extends from a point on the 

 eastern slope of the Canaan and Lebanon Range, one mile south of Fr)''s 

 Hill, in a S. 53° E. direction across the Shaker Valley, and up the west- 

 ern and southern slopes of the spur called Dupey's Moinit, to the crest 

 of the western branch of the Richmond Range. This group has not the 



