” 
112 Scientific Intelligence. 
“The Drift deposits which cover the glacial surface, consisting 
of fine clays below, sands and gravel above, large transported 
and polished rock surfaces. These clays are often accurately strat- 
ified, were apparently deposited in deep and generally quiet water, 
and mark a period when the glacial ice-masses, melted by a change 
1 
» P 
which they rest ; an effect largely due to the sand which gathers 
under them, acting as emery on a lead wheel. The water flowing 
ing fragments of ice, or as masses 0 zen gravel, or larger and 
more numerous boulders near the glacier. In some localities tor 
rents would pour from the sides and from beneath the glacier, 80 
that here coarse material would alone resist the rapid motion of 
the water, and the stratification of the sediments would be more 
or less confused.” 
The author next mentions the evidence of a general subsidence, 
greater to the north, and an ameliorated climate, as succeeding t0 
the Glacial era; and then makes the following observations oD 
the “ Yellow Sands and Surface Boulders.” 
I have, however, disproved, as I think, this theory 
