Crosbie Smith and Norton Wise, Energy and Empire: A Biographical Study of Lord Kelvin (Cambridge: Cambridge University Press, 1989), 556.
18
Rudwick, Earth's Deep History, 150.
19
William Hopkins, «On the Causes which may have produced changes in the Earth's superficial temperature,» Quarterly Journal of the Geological Society 8 (1 February 1852): 88.
