1. 1851. Phil. Mag., Dec. M. Jules Regnauld has since found experimentally, that 165 copper-bismuth elements balance the electromotive force of a single cell of Daniell's (seeComptes Rendus, Jan. 9, 1854, orBibliothèque Universelle de Genève, March 1854), a result agreeing with the estimate quoted in the text more closely than the uncertainty and indirectness of the data on which that estimate was founded would have justified us in expecting. The comparison of course affords no test of the thermo-electric theory; and only shows, that, as far as the observations of Weber and others alluded to render Pouillet's available for determining the absolute electromotive force of a copper-bismuth element, the absolute electromotive force of a single cell of Daniell's, obtained by multiplying it by the number found by M. Regnauld, agrees with that which I first gave on the hypothesis of all the chemical action being electrically efficientand so confirms this hypothesis
2. 1854. Proceedings of the Royal Society. Phil. Mag., July SeeInstead of 240°, conjectured from Regnault's observation when these details were first published, 280° is now taken as a closer approximation to the neutral point of copper and iron