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Extra info for Lord Kelvin and the Age of the Earth
28-35, 44-98; Toulmin and Goodfield (1966), Time, pp. 64-95; Greene (1961), Death of Adam, pp. 25-63; Davies (1969),Earth in Decay, pp. 27-94. 13 Haber (1959a), Age of the World, pp. 115-136, 146-159; Toulmin and Goodfield (1966), Ti:me, pp. 129-135, 142-149; Meyer, H. (195l),Age ofthe World. 14 DeMaillet's neglected work is now available in an excellent translation by A. V. Carozzi. See DeMaillet's (1969), TeUiamed. 15 Lamarck (1964), Hydrogeology, p. 75. Also see Haber (1959a), Age of the World, pp.
Both M. J. S. Rudwick and R. Rappaport have pointed out the need for a more thorough study ofthe Neptunist position (Rudwick (1969),GlacialTheory, pp. 136-57 and Rappaport (1964),Problems and Sources, pp. 60-77). 21 Haber (1959a), Age of the World, p. 214. For further discussion see Haber, pp. 187-215 and Gillispie (1959), Genesis, pp. 40-72, 98-120. 22 Huxley 23 (1897b), Christian Tradition, p. viii. Scrope ( 1827), Geology of Central France; Lyell ( 1830-33 ), Principles of Geology. Lord Kelvin and the Age of the Earth 20 24 Rudwick (1969), Lyell on Etna, p.
Adopting the third alternative, Kelvin next faced the task of marshaling the limited data available to him. His proposed model provided an ideal case for Fourier's mathematics, but meaningful results required quantitative values for the earth's internal temperature, the thermal gradient at its surface, and the thermal conductivity of its constituent rocks. Of these, the second seemed to present the least difficulty. D. Forbes and others to show that the thermal gradient varied with locality, but a temperature increase of 1°F in 50 feet was generally accepted as a probable mean.