NOTE.
The publishers' acknowledgments are due to Messrs. Houghton, Mifflin & Co., for permission to use "America and the Old World," by L. Agassiz; to Messrs. D.C. Heath & Co. for permission to use "Some Records of the Rocks," by Professor N.S. Shaler; and to Professor E.S. Holden for permission to use "What is Evolution?" and "An Astronomer's Voyage to Fairy Land."
LIST OF COLORED ILLUSTRATIONS
A Geyser. [Frontispiece,] See Page [ 47]
View in a Cañon, [ 12]
A Volcano, [ 48]
A Stalagmite Cave, [ 117]
Where Sponges Grow, [ 209]