This book is not written especially for geologists or other scientists as such, though it deals with the question which it discusses from a purely scientific standpoint, and presupposes a good general knowledge of the rocks and of current theories. It is addressed rather to that large class of readers to whom geology is only an incident in larger problems, and who are not quite wholly satisfied with those explanations of the universe which are now commonly accepted on the testimony of biological science. I am free to say that my own conviction of the higher value and surer truth of other data outside of the biological sciences have always been given formative power in my own private opinions…
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