436 J. D. Dana—Depression of Southern New England 
At Middletown, 20 miles in an air-line, by 30 feet. 
i “ by 524 f 
At Hartford, 85 miles, y 52% feet. 
At Springfield, 58 miles, - by 87 feet 
At Norwich, 15 miles, Ms by 224 feet. 
At Providence, 28 miles, a by 42 feet. 
Providence, though 26 miles from the Sound, is 28 miles from 
a line having the course of the shore meadows west of Point 
Judith. 
With an increase northward, in the depression, of only 1 foot 
a mile, the depression derived from the source here considered, 
would have been one-third less at each of the places. 
_ 5. Pitch of the stream during the flood—Owing to this depres- 
sion, the pitch of the streams seaward was diminished. From 
the above numbers we obtained for the average pitch of the 
rivers to the Sound approximately : 
8 feet per mile below Birmingham. 
. “6 “ce “ 
4°5 Middletown. 
S28 és * Norwich. 
1. foe = 6 Providence. 
In the highest modern floods, the pitch is about two feet below 
Birmin ham ; nine inches below Middletown ; six inches below 
Norwich ; and not over one inch below Providence. 
* This subsidence, so much greater to the north over New England than to the 
south, must have occasioned, as i 
cessation in the movement of the glacier; and in this condition the ice appeats 
have melted away. One important consequence of this is the absence from 
I have stated in other places, nearly or quite a 
