from the melting of the Quaternary Glacier. 199 
have had but slight working force, and the present low-water 
level would have been the lowest possible level at which this 
little work could have been done. An earlier consequence . 
might have been—the deposition of the till with no more strati- 
fication where it fell into the waters than when dropped outside 
or them. 
c. Effects of the change after the flood had made progress. — 
When the river had risen to a height of 60 or 80 feet above 
Haverhill 383 feet 
Windsor 299 * 
South Vernon, 336 f 
Springiiel: .. 3.54 224i 135“ 
The Middletown dam Beceem re a 5 RAs 
The mean slope and velocity on the above supposition, would 
hence have been for the part from— 
Velocity, Magee 
with width with width 
Distance _ Slope ft. ft 
: in miles. ft. perm. m.perh, ft. persec. m. perh. ft. per sec. 
Haverhill to Windsor.... 41 2 11515 16°89 LL 16°70 
a 2 39 
Windsor to South Vernon 49 1:3 10°: 15°15 10°22 =: 15°00 
8. Vernon to Springfield. 44 2'3 1108 1760 AGI: 27-82 
Springfield to Middletown 38 0 Buse ons wens wi0e 
Haverhill to Springfield... 134 19 113% «1667 | 1088. - 168 
Middletown dam to Sound 26 5°2 14°65 21°49 14°51 21°28 
According to the above, the river at maximum flood would 
have had no slope between Springfield and Middletown, and 
have therefore been in this part a great lake. But this condition 
Jour. sg deg Series, Vou. XXIII, No, 135.—Marocn, 1882. 
f 
