The Change in the Climate And Its Cause Giving the Date of the Last Ice Age Bas
The Change in the Climate And Its Cause Giving the Date of the Last Ice Age Bas
R a Reginald Adams Marriott
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Pretyman, M. P. , in discussing Why we may expect Warmer Winters, put forward an interesting surmise as to the possible cumulative effect of this change : " This matter has great practical interest as affecting the future conditions under which agriculture will be carried on, and it is important to consider whether the moment of warmest winters will be just at the time of least obliquity. To examine this, suppose we divide the 'Great Year' of 31, 000 years into twelve hypo- thetical months, eac...h representing about 2, 500 years, and let the time of greatest obliquity be December 21st, and of least obliquity June 21st, then on that hypothesis it is now June 16th or 17th of the present ' great year. ' ' The June temperature, especially in high latitudes, is much lower than that of July or August, and similar conditions might apply to the ' great year, ' and they would be still further accentuated as the ice-caps at the Poles are reduced, and if we assume these to have shrunk to much smaller dimensions in the next 400 years, the cold springs, which are the check to sub-tropical vegetation 57 in these latitudes, would presumably cease.
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