A. S. Eve and C. H. Creasey, Life and Work of John Tyndall (London: Macmillan, 1945).
61
Tyndall, Glaciers, 205.
62
Ibid., 206.
63
Ibid., 205.
64
Charles Piazzi Smyth, Teneriffe, An Astronomer's Experiment, Or, Specialties of a Residence Above the Clouds (London: Lovell Reeve, 1858).
65
Alexander von Humboldt and Aimé Bonpland, Personal Narrative of Travels to the Equinoctial Regions of the New Continent During the Years 17991804 (London: Longman Hurst, 1814), 110.
