wire with resistance equal to that of the electrolyte been substituted for the electrolyte. The difference between these two quanties of heat is equivalent to the heat which is due to the reverse chemical combination by combustion or other means." The problem was further investigated by Lord Kelvin. He reasoned as follows—: "Let unit quantity of electricity pass through a cell of infinitely small resistance; then, by Joule's law, the work done by the current is equal to E, the electromotive force. But ε gramme of one of the elements of the electrolyte has been electrolyzed, in accordance with Faraday's law. Let θ be the quantity of heat developed by the combination of one gramme of this element to reproduce the electrolyte, then, since no work is expended in any other part of the circuit
E = Jεθ, and therefore θ = EJε.
J = the mechanical equivalent of heat."
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Lord Kelvin died on 17th December 1907, the result of a severe chill, and his remains were buried in the nave of Westminster Abbey. It was an ever-memorable occasion, when an enormous concourse of men of science and others attended the funeral. Kelvin's grave is next to that of Sir Isaac Newton, who was buried in 1727. On the gravestone of the latter are the words: "Hic depositum est quod mortale fuit Isaaci Newtoni." Newton's
