"In the Easter holidays of 1881 Helmholtz went to London with his wife at the invitation of the Chemical Society to give a Lecture in the place 'in which the great investigator Faraday, whose memory was to be honoured, had so often surprised his admiring audience by his revelations of the unsuspected secrets of nature.' His discourse on 'The Recent Development of Faraday's Ideas on Electricity' ranks from its form and content among the most beautiful and profound of his Addresses. ...Commencing with an historical review of the development of Electrodynamics, which culminated in a brilliant exposition of the Faraday-Maxwell Theory, he for the first time gave a connected account of the relation between electrical and chemical forces... To arrive at an understanding of the relations between electrical forces and chemical affinity, he shows from the phenomena of electrolytic dissociation how we are to picture the ponderable atoms as bound up with electricity. He concludes from the assumption that ions are charged with electricity, that a wandering group of atoms invariably carries the same charge of electricity with it, and that electricity itself is composed of definite elementary particles which behave like the atoms of electricity."