The Geology of Hingham. 55 



The second pot-hole has its bottom three feet above that of the 

 lowest one, and a perpendicular line from the centre of each shows 

 the two to be three feet apart. The wall dividing them must have 

 become, while yet action went on within them, very thin, and prob- 

 ably one broke into the other before it ceased altogether. The 

 whole southern side of this second hole, which is marked/No. 2 in 

 Figure No. 4, is gone, and water can now stand in its bottom to 

 the depth of only about two inches. 



The concavity above this, which formed the northern portion of 

 the hole, exhibiting as it does a well-worn surface of three feet in 

 width, shows that it must have been as large as or larger than the 

 first. This concavity can be discerned to the height of live feet, 

 where further traces are lost ; but, as is the case with No. 1, the 

 whole depth of the pot-hole may have been much greater than 

 what is indicated. The slope of what remains of the walls of 

 these holes shows that the flow of water over the rock surfaces 

 was from the northwest. That of No. 2 approximates to 30° from 

 that direction towards the southeast. 



Of No. 3, so designated in Figure No. 4, there is but little to be 

 said except that it is small and shallow. It is 4 feet 9 inches 

 above No. 2 in a northwest direction, and there may be traced 

 from it westerly a narrow water channel about six feet in length. 



The fourth of the pot-holes to be mentioned is or was the 

 largest of all, and hence has been called by the people near by 

 the" " Well." It is designated as No. 4 in Figure No. 5. Passing 

 over the rocky elevation in a northerly direction, it may be found 

 about a hundred feet distant from the others, in front of a cliff 

 which faces an opening in the rocks more immediately near the 

 water. This pot-hole, unlike those previously mentioned, is not 

 found on a sloping portion of rock, but is on a flat surface directly 

 at the base of the cliff. Horizontally, the form of it is oval, and 

 its largest diameter, which is northeast and southwest in direc- 

 tion, is four feet, the narrowest two feet ten inches. The depth 

 at which water is now retained is about a foot. 



The cliff rises nine feet high from the margin of the "Well" 

 and ten feet from its bottom. 'The " Well " itself was probably as 

 deep at least as ten feet, the curvature and wearing of the rock of 

 the cliff above the present hole clearly showing this. 



The rocky ridge in which all these pot-holes or kettles are found, 

 has a height of from 20 to 25 feet, and is of granite. Besides 

 the pot-holes of which an account has been given, there are other 

 depressions showing distinctly a commencement of action towards 

 their formation. Two of such may be found 20 feet in a north- 

 erly direction from those numbered 1, 2, and 3; that is, between 

 these and the one called the " Well," No. 4. One is shallow, 

 appearing like the bowl of a spoon, about a foot across, show- 

 ing, extending from it, a water-worn channel sloping easterly to 

 the edge of the rock surface, about ten feet ; and on a lower sur- 

 face of the same rock, another and larger depression just where 



