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To speak more specifically, we find, in the first place, that instead of assuming the denudation produced by rain and rivers to be the sole means of wearing down lands and producing their irregularities of surface, geologists now see that denudation is only a part-cause of such irregularities; and further, that the new strata deposited at the bottom of the sea, are not the products of river-sediment solely, but are in part due to the actions of waves and tidal currents on the coasts.
And this is a part-cause probably the chief cause why precocious children, and youths who up to a certain time were carrying all before them, so often stop short and disappoint the high hopes of their parents.
That this is a part-cause is true. Doubtless very often, as Mr. Bain says, "it is the coerced form of seriousness and solemnity without the reality that gives us that stiff position from which a contact with triviality or vulgarity relieves us, to our uproarious delight."
But 10,000 years hence, the northern hemisphere will undergo annual variations of temperature far more marked than now. In the last edition of his Outlines of Astronomy, Sir John Herschel recognizes this as an element in geological processes; regarding it as possibly a part-cause of those climatic changes indicated by the records of the Earth's past.
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