Abstract
IN NATURE, vol. xxi. p. 201, which reached me only recently, I find a letter of your correspondent “R”, to whom I am much obliged for having pointed out to me an error into which I had fallen, in common with many others. I may quote, e.g., the exhaustive work of Ruhlmann1, where, in the chapter on the history of the molecular theory, Joule is only alluded to, and immediately afterwards the theory of Kronig is given in extenso, without any hint that it is practically identical with that given by Joule in 1848. Having read “R's” letter, I immediately procured the original article of Joule, and I am now ready to admit that Joule's article contains all that is essential to Kronig's method of computing the velocity of gas molecules. It is true, the formula itself as an algebraical expression is not found there, but the calculations given are to all purposes equivalent to the formula.
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