324 



They were a shark's tooth, a cetacean vertebra, Lignite, and 

 a cast of Tellina, which were found in Marshfield, in a clay 

 marl, over a green sand, thirty feet from the surface ; they were 

 precisely like those found at Gay Head. 



Dr. Hitchcock considers the absence of pot-holes in Mas- 

 sachusetts, a fact ill favor of the glacial theory, by showing 

 the improbability of currents of water setting over the 

 surface. 



Dr. Jackson found several of these holes in Orange, N. H., 

 filled with round, polished stones, one thousand feet above the 

 level of the sea, in the hardest kind of granite, such as is found 

 at Bellows Falls. The pot-holes at Orange were in some cases 

 eleven feet deep, those at Bellows Falls five feet, so that their 

 existence at the former place indicates a current flowing twice 

 as long as the Connecticut River, at Bellows Falls. He also 

 noticed striae running in the same direction as the line of pot- 

 holes. In New Jersey he noticed no scratches, though there is 

 plenty of drift ; but on the northeast side of a mountain ridge, 

 eighteen hundred feet above the sea, where we can hardly im- 

 agine a current of water with the present conformation of the 

 country, was a well-marked pot-hole, three feet deep and four in 

 /diameter, with polished bottom and lower part of sides. This 

 locality is about two miles from Mt. Pleasant. This must have 

 been made by a current of water setting to the northeast, as no 

 drift scratches can be seen. At Franklin, there is another, four 

 feet in diameter, in white limestone, v/here no stream now could 

 produce it. The absence of drift scratches is interesting, as 

 showing that the glaciers, if they produce them, must have dis- 

 appeared before extending to New Jersey. Pot-holes, however, 

 are not inconsistent v/ith the currents of glaciers ; there are 

 frequently strong currents on the surface of glaciers, which, 

 through crevices and holes might cause similar phenomena under 

 the glacier. 



Dr. Burnett read some observations on the relations of 

 an order of Parasites (Lice) to the different Fauns3j as 

 bearing 1st, on the distinct creation of types of animals; 

 and 2d, on the local creation of these types wherever they 

 are found. 



