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[Bouv4. 
were called pot holes in the rocks of the coast at Cohasset ; but 
being especially engaged, during all the hours I could spare from 
business cares, in preparing a report for the forthcoming History 
of Hingliam upon the Botany and Geology of that town, I post- 
poned visiting the locality where they were said to be, until near 
the close of the last season, when by the courtesy of Mr. Charles 
S. Bates, the owner of the land, I visited it in his company. What 
I saw there was particularly interesting and I may add quite aston- 
ishing when I called to mind the fact that Dr. Charles T. Jackson 
had lived several seasons within about a mile of the spot, and that 
if the pot holes had ever come under his observation he would not 
have failed to give a full account of them before this Society. To 
make sure that he had not done this, I carefully looked through all 
the volumes of its Proceedings ; but finding nothing concerning the 
matter in his communications, I thought it my duty to present here 
what I now do. 
The pot holes are to be found in Little Harbor, Cohasset, on 
Cooper’s Island, so called, which however is not an island in the 
sense of being a body of land surrounded with water, but from its 
being a somewhat elevated land surrounded partly by water and 
partly by low marshy ground. There is a border of rocky cliffs on 
the northern portion of the east coast of this island which end at a 
beach that separates them from other cliffs farther south ; and it is 
near the termination of those first mentioned and quite close to the 
beach that the pot holes are found. Just before this termination 
there is a partial separation of the rocky mass by an opening on the 
water side, which however rapidly narrows inland but a few feet 
from the water. It is on the northern side of this opening, that is, 
on the rock that slopes towards the south, and very near the water 
at low tide, that two of the holes, or what remains of them, may be 
readily seen when the tide is out. 
Of the lowest of these and the best preserved of them and which 
I designate as No. 1, there yet remains a pot hole in the rock 
which will hold water to the depth of 1 foot 9 inches, having a well 
defined rim just at the surface of the water. The diameter of it at 
rim is 25£ inches ; below the rim 30 inches. Above this rim the whole 
southern side of what once formed a portion of the kettle is gone ; 
but on the northern side there remains, as a concavity in the rock, 
what formed a part of it, having well-worn marks upon the surface 
and these are plainly discernible for a height of 4 feet. From the 
