 In 1861, Helmholtz gave a lecture, “A Universal Method of the Transformation of Problems of Electrical Distribution,” to the Society for Natural History and Medicine at Heidelberg. Helmholtz was unaware that, in letters to Liouville, William Thomson (Lord Kelvin) had achieved the same results that he had, but he was told of this immediately afterward. Helmholtz, who had met Kelvin in 1855 and had been corresponding with him since 1856, acknowledged Kelvin’s priority in the Transactions of the Heidelberg society in 1862, and wrote to Kelvin to ask whether he would be willing to publish his results about the “distribution of electricity at a circular edge” (Königsberger 1906, 206). Kelvin responded with his own results. Between 1861 and 1864, James Clerk Maxwell postulated that light was an electromagnetic wave in the ether (Assis 1994, 18). In 1864, Helmholtz traveled to England. During the trip, Helmholtz met with Kelvin, John Tyndall, George Stokes, James Joule, Michael Faraday, Thomas Huxley, Thomas Graham, Max Müller, and Maxwell. He visited Graham’s, Maxwell’s, and Kelvin’s laboratories. By the end of the 1860’s, Helmholtz was well informed on the experimental and theoretical basis of the new electrodynamic theory in England. 