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If the direction of the motion of the ice-sheets, which caused these
markings, was,--as the glacialists allege,--always from the elevated
region in the north to the lower ground in the south, then the
markings must always have been in the same direction: given a fixed
cause, we must have always a fixed result. We shall see, as we go on
in this argument, that the deposition of the "till" was
instantaneous; and, as these markings were made before or at the same
time the "till" was laid down, how could the land
[1. "Climate and Time," p. 391.
2. "Popular Science Monthly," October, 1879, p. 833.]
{p. 26}
possibly have bobbed up and down, now here, now there, so that the
elevation from which the ice-sheet descended
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SKETCH OF GLACIER-FURROWS AND SCRATCHES AT STONY POINT, LAKE ERIE,
MICHIGAN.
_aa_, deep water-line; _bb_ border of the bank of earthy
materials; _cc_, deep parallel grooves four and a half feet
apart and twenty-five feet long, bearing north 60° east;
_d_, a set of grooves and scratches bearing north 60° west;
_e_, a natural bridge.


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