104 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 2j 
Russell (Israel C.) — Continued. 
2. Physiographic problems of to-day. 
Jour. Geol., vol. 12, pp. 524-550, 1904. 
Discusses the scope, nomenclature, and field of investigation of physiography 
the use of ideal physiographic types, the primary and secondary features c 
the earth's surface, and the relations of physiography to life and man. 
3. North America (Appleton's World Series: The regions of th« 
world). 
New York, D. Appleton and Company, 435 pp., 8 pis., 39 figs., 1904. 
Includes chapters on the margin of the continent, the topography of the land I 
climate, plant life, animal life, geology, the ahorigines, and political geogrs 
phy. In the chapter on geology describes the growth of the continent, th i 
distribution and character of the rocks of which it is composed, and th 
occurrence of economic products. 
4. Douglass Houghton. 
Mich. Acad. Sci., 4th Rept, pp. 160-162, por., 1904. 
Gives a brief account of his life. 
5. Bela Hubbard. 
Mich. Acad. Sci., 4th Rept., pp. 163-165, por., 1904. 
Gives a brief account of his life. 
6. See Fairchild (H. L.), 3. I 
S. 
Salisbury (Roll in D.). 
1. Three new physiographic terms. 
Jour. Geol., vol. 12, pp. 707-715, 5 figs., 1904. 
Defines, discusses, and illustrates the application of the physiographic ternr.n 
topographic unconformity, topographic and structural adjustment, an 
superimposed youth. 
Salisbury (Rollin IX), Chamberlin (Thomas C), and. 
1. Geology. In two volumes. Vol. 1. Geologic processes and thei 
results. 
See Chamberlin (Thomas C. ) and Salisbury (Rollin D. ), 1. 
Sapper (Karl). 
1. Die Alta Verapaz (Guatemala). 
Mitth. d. Geog. Ges. in Hamburg, Band 17, pp. 78-214, 5 pis. (maps), 1901. 
Describes the general geology, the character and occurrence of pre-Paleozoii j 
Paleozoic, Mesozoic, Tertiary, and Cenozoic formations, the geologic histor; | 
and the petrology of this region. 
2. Die sudlichsten Vulkane Mittel-Amerikas. 
Zeitschr. d. Deutsch. geol. Gesellsch., Bd. 53, pp. 24-51, 5 figs., 1901. 
Describes volcanoes in the southern part of Central America. 
3. Das Erdbeben in Guatemala vom 18. April 1902. 
Petermanns Mitteilungen, Band 48, pp. 193-195, 1 pi. (map), 1902. 
Describes the earthquake of April 18, 1902, in Guatemala. 
4. Die vulcanischen Ereignisse in Mittelamerika im Jahre 1902. 
Neues Jahrb. f. Min., etc., Bd. 1, pp. 39-90, 7 pis., 8 figs., 1904. 
Describes volcanic eruptions of 1902 in Central America. 
