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Updated: May 20, 2025
Its exhaustion would, nevertheless, under the most favourable circumstances, ensue in a comparatively short period. Many other objections equally unanswerable have been urged to the "regenerative" hypothesis, but this one suffices. Dr. Croll's collision hypothesis is less demonstrably unsound, but scarcely less unsatisfactory.
It had been necessary that Marie should sign her name some half-dozen times, and Marie's father had made all the necessary forgeries. It had been of course necessary that each name should be witnessed; but here the forger had scamped his work. Croll's name he had written five times; but one forged signature he had left unattested! Again he had himself been at fault.
The man thought that it was something special, as Croll had declared his purpose of waiting when told that Mr Melmotte was not as yet dressed. This happened at about nine o'clock in the morning. Melmotte longed to know every detail of Croll's manner, to know even the servant's opinion of the clerk's manner, but he did not dare to ask a question.
Croll's estimate is the more probable one, it would only push the cold temperate zone down to the line of the Gulf States; the warm temperate, to the southern line of Mexico; the sub-tropical, to the Central American States, and the tropical to the United States of Columbia, Venezuela, and Guiana.
At its fulness, the great ice mass lay almost a mile in depth over New England, as attested by the scratched and polished rock surfaces and deposited erratics in the White Mountains. Such a mass presses down with a weight of about one hundred and twenty-five tons to the square foot, according to Dr. Croll's estimate.
"'Not proven' is the verdict which most geologists would return." "The confidence with which Croll's theory was first received has been a good deal shaken." "We have to fall back, therefore, on the geological evidence of deposition and denudation ... in any attempt to decide between the 200,000 years of Lyell and the 20,000 years of Prestwich."
Melmotte continued to look at him; but then came upon the old clerk's countenance a stern look which amounted to very strong dissent. And yet Croll had been conversant with some irregular doings in his time, and Melmotte knew well the extent of Croll's experience. Then Melmotte made a little remark to himself.
The 200,000 years for the ice-age depends chiefly on Croll's theory of secular variation of the earth's orbitular eccentricity; but we are told it is open to the "objection that it requires us to assume a periodical succession of glacial epochs" of which two or three "must have occurred during each of the great geological epochs. This is opposed to geological evidence."
Dr. Roque. Thus the Gulf Stream would be nipped in the bud, and, according to Dr. Croll's estimates, the results would be disastrous for the northern hemisphere. The anti-trades, which now are warmed by the Gulf Stream, would then blow as cold winds across the shores of western Europe, and in all probability a glacial epoch would supervene throughout the northern hemisphere.
Croll's conclusion that successive Glacial periods in the one hemisphere coincide with warmer periods in the opposite hemisphere, together with the admission of the slow modification of species, explains a multitude of facts in the distribution of the same and of the allied forms of life in all parts of the globe.
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