[253] Amer. Jour. Sci., 1893, 3d series, Vol. 45, p. 7.
[254] Essentially the same as atmospheres.
[255] The pressures and densities here given are essentially the same as those previously worked out by others and already published. The temperatures are the results of recent preliminary computations made under the auspices of the Carnegie Institution, and are subject to change on further study. They are based on the assumption that the increase in density is due to compression. They are in general accord with the results previously reached by Dr. F. R. Moulton (see “A Group of Hypotheses Bearing on Climatic Changes,” by T. C. Chamberlin, Jour. of Geol., 1897, p. 674). The Rev. O. Fisher, in the Am. Jour. of Sci., 1901, p. 420, gives much higher results.
[256] Attention was called to this feature by Chamberlin in a paper before the Geol. Soc. of Am. at Rochester, December, 1901.
[257] These are reckoned by assuming that the temperature of no variation at 50 feet below the surface is 40° F.
[258] Am. Jour. of Sci., Vol. V, 1898, p. 161.
[259] Van Hise. Personal communication.
[260] Bull. 168 U. S. Geol. Surv., p. 14.
[261] Daniell’s Physics, p. 407.
[262] Heat. Tait, p. 225.