ILLUSTRATIONS Xx1x 
ACKNOWLEDGMENT OF ILLUSTRATIONS 
I am indebted to the following sources for the illustrations enumerated. 
Some of them have been changed to suit the needs of the book. 'The source 
of a few of the photographs could not be determined. The great majority of 
the original photographs are the result of the excellent photographic work of 
Mr. J. O. Martin, a student at Cornell. The photographs of fossils, and some 
of the views, were made by Mr. B. F. White of Ithaca. 
Black, J. W. (Photographer), Boston, Mass. (Fig. 122). 
Calvin, Professor S., State Geologist of Iowa, Des Moines (Fig. 147). 
Canadian Geological Survey (Photograph by) (Fig. 225). 
Challenger Reports, Narrative (Figs. 145 and 146). 
Chamberlin, Geikie, The Great Ice Age (Fig. 265). 
Dale, Thirteenth Annual Report, U. 8. Geological Survey (Fig. 227). 
Dana, Characteristics of Voleanoes (Figs. 189 and 200). 
Davis, American Journal of Science, Vol. I., 1896 (Fig. 172). 
Gardner, J. L., 2d, Boston, Mass. (Photographs by), (Figs. 28, 31, 61, 180, 
176, 266). 
Gilbert, Bull. Geol. Soc. America, IV., 1893 (Fig. 1) ; National Geographic 
Monograph, Vol. I. (Fig. 83); Fifth Annual Report, U. 8. Geological 
Survey (Figs. 93 and 177); Presidential Address, Geol. Society of 
Washington (Fig. 154). 
Harden, E. B., Philadelphia, Penn. (Plate 14). 
Harvard College (Department of Physical Geography, Professor W. M. 
Davis — Lantern slides) (Figs. 92 and 125). 
Hawaiian Government Survey (Fig. 199). 
Haynes, F. J. (Photographer), St. Paul, Minn. (Figs. 33, 34, 47, 57, 80, 84, 
89, 91, 107, 179, 220, and 221 ; Plates 3 and 9). 
Haushofer, Wall Charts of Ideal Landscapes (Figs. 244, 245, 257, and 264). 
Heim, Mechanismus der Gebrigsbildung (Fig. 192). 
Hitchcock, etc., Geology of Vermont, Vol. I. (Fig. 226). 
Hovey, Proc. Amer. Assoc. Adv. Science, 1882, Vol. XX XI. (Fig. 68). 
Haworth, Missouri Geol. Survey, Ann. Rept., 1894 (Fig. 25). 
Jackson Photograph Co., Denver, Col. (Figs. 48, 55, 58, 86, 117, 141, 180, 
and 198). 
James, C. H. (Photographer), Philadelphia, Pa. (Fig. 70). 
Johnston-Lavis, The South Italian Volcanoes (Fig. 206). 
Kent, Great Barrier Reef (Figs. 137, 142, and 143). 
Keyes, Iowa Geological Survey, Vol. III., 1893 (Fig. 268) ; Missouri Geol. 
Survey, Ann. Report, 1894 (Fig. 162). 
Kobayshi, Meteorological Observatory, Tokio, Japan (Fig. 217). 
Koto, Journal College of Science, Japan (Figs. 170 and 218). 
