Abstract
The subject I have to speak about this evening is not exactly geological. I may say that the immediate proposal to lecture on such a subject is to be found in an extract which I shall read to you from Dr. Croll's book on Climate and Time . In chaps. xxiii., xxiv., of this volume Mr. Croll deals with the physical causes of the submergence and emergence of land during the glacial epoch, and he has given some very curious, while at the same time mathematically correct, explanations of the effects due to a certain assumed displacement of ice from one hemisphere to the other. After loyally calling attention, in his opening words, to the fact of his having been anticipated by M. Adhémar, (in a work Révolutions de la Mer,) in the suggestion of heaped-up ice being a probable cause of the submergence and emergence of land, Mr. Croll proceeds to investigate in a very masterly manner the probable effect of an ice-cap of a given description. In this connection Mr. Croll refers to an article on the subject published by him in the Reader for January 13, 1866, and the extract which I will now read to you from this volume, Climate and Time (pp. 372-374), consists of a note written by myself, at Mr. Croll's request, in regard to the objection brought forward in that article:— “Mr. Croll's estimate of the influence of a cap of ice on the sea level is very remarkable in its relation to This 250-word extract was created in the absence of an abstract
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