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 
abundance 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 Range, 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 Richmohd 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, Shape 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. 
b. SECOND ۰ 
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 Fry’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 Mount, to the crest 
of the western branch of the Richmond Range. This group has not the 
