over the New Haven Region. 349 
the height of the ice-surface above the sea-level at Wells River 
nd the White Mountains was at least 6,000 feet. On this 
assumption, and supposing the slope of a line on the surface in 
the direction of the valley equable, and the height at the south- 
ern termination on Long Island, 100 feet, the height over the 
region of Windsor and Mt. Ascutney, in Vermont, would have 
been about 4,500 feet, and over the New Haven region very 
nearly 1,000 feet. 
It is still a question whether the height of the ice-surface to 
the northward was due solely to the accumulation of ice and 
not partly to an increase in the southward slope of the land. 
Yet, since even an increase in elevation of 500 feet would make 
little difference in the result, it follows, if the above conclusion 
as to the amount of slope required for movement in the valley 
is admitted, that 
(1) For movement down the valley the ice should have had nearly 
or quite its maximum thickness; that is, the maximum thickness 
of the great glacier over that region. Further, that 
(2) Lts flow could not have continued after melting had far ad- 
t 
2. The fact of a southeastward movement in the upper ice of the 
Glacier 
_ The evidence as to a southeastward movement in the upper 
Ice is afforded by glacier scratches outside of the valley, and by 
transported bowlders within it as well as outside. 
Glacial scratches over the high plateaus of western and 
horthwestern Connecticut, 800 to 1,500 feet in elevation, have 
directions between S. 12° E. and S. 45° E. 
Greenland, but better measurements and knowledge of conditions are needed 
before any confident conclusion can be drawn. 
the surface along the line crossing the St. Lawrence valley may have been level, 
and the slope confined to the ice above and below it; and that above may have 
been only just enough to keep the St. Lawrence valley full to the vel. 
Jour, Sc1.—Tuip Series, Vou. XXVI, No. 155.—Nov., 1883. 
