I 



130 WiNTflROP's Barometrical Ohservaiions. 



Weatlicrsfield, in Vermont, is about one hundred and 

 fifty miles from the mouth of the Connecticut. The de- 

 scent of that river is therefore, about two feet to a mile on 

 an avern^'-e. No current is perceptible in the lake, ^as I am 

 informed, till we come near St. John's; which is about two 

 hundred miles from Quebec. This latter place, being near 

 the upper part of the Gulf of St. Lawrence, maybe consid- 

 ered as near the level of the sea. The descent of water then, 

 is, by the preceding table, about twenty or twenty one 

 inches to a mile. Burlington bay is separated from Onion 

 river by a point of land. The mouth of the river is about 

 forty three miles from the place, where our observation was 

 made on the banks. The descent is, by the same table, one 

 hundred and seventy two feet; which is four feet to the 

 mile : yet the rapidity of its current is not so great, as to 

 occasion any inconvenience in fording it in the summer sea- 

 son. The width of the river is generally, where w^e had an 

 opportunity of seeing it, from twenty to thirty rods; and 

 its depth, in the channel at the fords, about two feet. 



On September the 22d, 1780, I made the following baro- 

 metrical observations at the Grand Monadnock, a large 

 mountain, between the towns of Dublin and Jaffrey, in New 

 Hampshire. At the foot of the hill, the barometer stood 



at 



Immediately above the . ^^ 



woody region. j ' ^obJ 



At the summit 26. 4 3254 



28. 4 1395 feet above the sea. 



Mean at Cumbridge 20. 95 42. 5 



The 



