from the melting of the Quaternary Glacier. 185 
a mile from the gap through the trap for the Farmington River, 
and has a height, by aneroid, of 210 to 215 feet. The plain in 
the vicinity of the Manchester depot, on the east of Hartford, is 
about 200 feet in height. 
South of Hartford, east of the Connecticut, in Glastenbury, a 
i spreads two t 
rd, with a height of 170 to 190 feet. Two miles 
north of Middletown it is reduced to a broad shelf against the 
eastern hills, a mile or more from the river, and has a height of 
186 feet above mean tide east of Gildersleeve’s landing. 
At Middletown, where the river turns eastward to pass the 
Narrows, the waters spread 2 to 4 miles west of the Connecticut. 
At Rock Falls, and just beyond, the terrace deposits have a 
height of 193 to 199 feet above mean-tide; and at Pine Grove 
Cemetery the wide plain is, according to an aneroid measurement 
by Professor Wm. North Rice, of Middletown, 199 feet. 
The facts make the maximum height at Middletown probably 
between 193 and 199 feet. 
Nearly two miles southwest of Middletown, just east of the 
Haddam road, stratified sand and gravel make the upper part of 
a hill which is 235 feet high above mean tide. If a part of the 
terrace-formation, it would make the maximum level of the flood 
and of the Middletown dam 40 feet above the height just men- 
tioned. But it has a capping 3 to 4 feet thick of coarse unstrati- 
either side of the stream of 420 to 440 feet ; in Northfield the ter- 
race rises toward the hills 15 feet above the level taken for the 
