36 C. E. VAN ORSTRAND 
escape of heat from the earth, and incidentally causing changes in the 
thermal gradient. 
Tests in one well or more drilled between Thermopolis and the 
Warm Springs dome would have given important evidence on the 
amount of heat transferred by water. With existing data (Fig. 11) 
and Darton’s (40) description of the movement of the water, it may 
still be possible to reach conclusions of more or less importance. 
Geothermal prospecting may succeed in certain areas. Under the 
most favorable circumstances it would be necessary to make tests in 
core drill holes extending through a period of several months in order 
to be sure that true rock temperatures are obtained. Ordinarily, 
the holes would have to be drilled to a depth in excess of 500 feet. A 
less depth would doubtless be required over shallow salt domes. 
BIBLIOGRAPHY 
1. A. S. Eddington, Stars and Atoms, Yale University Press, New Haven, Con- 
necticut (1927), p. 102. 
Harold Jeffreys, The Earth, Macmillan Company (1929), pp. 76-77- 
Hans Reichenback, Atom and Cosmos, Macmillan Company (1933), 300 pp- 
2. Charles E. St. John, “Growth in Our Knowledge of the Sun,” Ann. Rept. 
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3. H. N. Russell, R. S. Dugan, and J. Q. Stewart, Astronomy, Vol. 2, Ginn and 
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Reference 1. Jeffreys, p. 144. 
Avibue Holmes, “Radioactivity and Geological Time,” in “The Age of the Earth,” 
Nail. Res. Council Bull. 80, Washington, D. C. (1931), pp. 218 and 230. 
Gea Sepbigzots “Radium Content of Ocean Bottom Sediments,” Amer. Jour. 
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6. L. H. Adams, ‘Temperatures at Moderate Depths within the Earth,” Jour. 
Washington Acad. Sci., Vol. 14 (December 4, 1924), pp. 459-72. 
7. Harold Jeffreys. See reference 1, p. 154. 
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(1931), p. 108. 
g. Reference 1, p. 151. 
10. Reginald A. iBek, “The Depths of the Earth,” Science, Vol. 77 (January 27, 
1933), PP. 95-102. 
11. William Bowie, ‘‘A Gravimetric Test of the ‘Roots of Mountains’ Theory,” 
U.S. Coast and Geod. Survey Serial 291 (1924), pp. 3-8. 
, ‘Notes on the Airy or ‘Roots of Mountains’ Theory,” Science, Vol. 63 
(April 2, 1926), pp. 371-74. 
See also reference 7. 
12. Osmond Fisher, Physics of the Earth’s Crust, Macmillan Co. Second Edition 
(7889), pp. 222-29. 
13. Charles H. Lees, ‘On the Shapes of the Isogeotherms under Mountain Ranges 
in Radioactive Districts,” Proc. Roy. Soc. London, Vol. A. 83 (January 8, 1910), p. 346. 
14. Harrison E. Patten, “Heat Transference in Soils,’ U. S. Bur. Soils Bull. 59 
(1909). 54 pp. 
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Macmillan Company (1895), p. 241. 
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