Excerpt from The Mining Magazine, Vol. 4: From January to June, 1911 T IS known that in the Pleistocene period much of the northern hemisphere was covered with ice, and that parts of Europe now mild and fertile were then frost-bound. In other words, the climate was much colder than at the present day. Why should there have been this interval of coldness and then an increase in mean temperature? Probably the principle of 'recalescence' has been al ready suggested, though we do not remember to have seen it so applied. At certain defined points the fall in the temperature of cooling bodies pauses and a slight rise ensues before the fall continues once more. Steel has three such points at 15000, and 1250 Degreesf, re spectively, and the curve of cooling shows hollows followed by small crests. During the Ice Age the earth may have occupied-a hollow of this nature, and we may now be living in a period of recalescence. This theory is fur ther strengthened by the evidence which shows that the Ice Age more probably consisted of a series of cold periods instead of only one um interrupted era of geological time. We put this suggestion forward and hope that some of our geologist and physicist friends will discuss it. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.