We take this opportunity of acknowledging the courtesy of the following publishers, who have helped us in connection with the illustrations of this book:-- D. Appleton and Company (Figs. 13, 35, 39, 40, 41, 42, 43, 44, 45 and 46, "Volcanoes: What They Are and What They Teach," by J. W. Judd; Fig. 15, "Principles of Geology," by Sir C. Lyell).…
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