Chapter I

Thomson (Kelvin). _Rep. Brit. Ass._, p. 1819. 1855.
—— _Proc. Glasgow Phil. Soc._, Vol. IV, p. 272. 1860.
—— _Phil. Mag._, February, 1862, p. 158. 1861.
—— _Popular Lectures and Addresses_
[_P.L.A._], Vol. I, p. 349. 1862.
—— _Natural Philosophy_, Appendix D.
—— _P.L.A._, Vol. II, p. 6. 1865.
—— _P.L.A._, Vol. II, p. 10. 1868.
Huxley. _Presidential Address, Quart. Journ. Geol. Soc. 1869._
Thomson. _P.L.A._, Vol. II, p. 73. 1869.
—— _P.L.A._, Vol. II, p. 238. 1876.
—— _P.L.A._, Vol. I, p. 369. 1887.
King. _Am. Journ. Science_, p. 1. 1893.
Correspondence in _Nature_. Perry, Kelvin, Tait.
January 3rd, March 7th, April 18th. 1895.
Poulton. _Rep. Brit. Ass._, p. 808. 1896.
Kelvin. _Phil. Mag._, January, 1899, p. 66. 1897.
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Wilson. July 9th.
Darwin. September 24th.
Joly. October 1st.
Correspondence in _Nature_.
Kelvin, Strutt, Lodge, etc. September 20th. 1906.

For other references see below.