Présentation de l'éditeur
This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
Présentation de l'éditeur
The cause of the ice ages was a puzzle to nineteenth-century climatologists. One of the most popular theories was that the affected continents must somehow have been hugely elevated and, like mountains, iced over. However, in this 1885 study of the problem, James Croll (1821–90) argues that such staggering movement would have been impossible. Instead, he puts forward a new theory: that the eccentricity of the earth's orbit changes at regular intervals over long periods, creating 'great secular summers and winters'. Adopting a meticulous approach to the facts, he disproves a host of well-established notions across several disciplines and makes some remarkable deductions, including the effect of ocean currents on climate, the temperature of space, and even the age of the sun. With a focus on logical argument and explanation rather than mathematics, his book remains fascinating and accessible to students in the history of science.
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