All rights reserved
October, 1907
[ACKNOWLEDGMENTS]
We take this opportunity of acknowledging the courtesy of the following publishers, who have helped us in connection with the illustrations of this book:—
Henry Holt and Company ("Physiography," by Rollin D. Salisbury).
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).