266 SURFACE GEOLOGY, 
form, rests slanting against the hill-side, so as to make a natural shed for 
the cattle. 
Churchill rock received its name sixty years since, from the circum- 
stance that a lunatic of that name escaped from his keepers, and was 
discovered on top of this boulder. It will be seen that the rock is 
divided by a crevice, originally a joint, providing a space usually a few 
inches in width. Mr. Churchill must have crawled up through this nar- 
row opening, doing, like other persons in his condition, what seems 
almost impossible. It was found necessary to fell a tree upon the rock 
to insure for the man a safe descent. The base of the stone is below 
the feet of Gov. Prescott, as represented in the heliotype, who stands 
the lowest down of the four persons seen in front. The top is midway 
of a pine tree with a trunk nearly two feet in diameter, and was thought, 
by some on the ground, to be 80 feet high. ; 
Chase rock is well shown in another heliotype, with a profile view upon 
its summit of Erastus H. Chase, the proprietor of all these large boul- 
ders. Fifty years had elapsed since he climbed the boulder before. He 
took great enjoyment when a lad in climbing this rock. It is much more 
narrow when viewed from either end. 
On passing nearly to Round pond, almost three quarters of a mile 
from the Pawtuckaway notch, we reach Ballad rock, so named from a 
preacher who used one of the projections for a pulpit in the early history 
of the town. A heliotype sketch of this is presented, showing two or 
three of the constituent boulders of this moraine, for it is a terminal pile 
of rubbish. It may have collected behind a ledge, though it is not always 
easy to separate ledges from boulders in this vicinity. The largest stone 
is 60 feet long and 40 feet wide, and ovoid in shape. The moraine itself 
is 150 feet wide and over 100 feet high. Five or six of the large boul- 
ders in it are readily discernible to the visitor. The view is somewhat 
defective, because of the difficulty of obtaining a good light in the forest 
late in the afternoon. This moraine is really more remarkable than the 
single large boulders, because it is composed of several pieces, each as 
large as Chase, if not Churchill rock. The ridge extends to the pond, 
and its base is crossed by the road. 
We find, therefore, in this short distance of three quarters of a mile, 
certainly a dozen boulders, each exceeding 25,000 cubic feet in dimen- 
