the Conservation of Solar Energy. Whether true or not—and time will probably decide—the solar hypothesis of Siemens revealed its author in a new light. Hitherto he had been the ingenious inventor, the enterprising man of business, the successful engineer; but now he took a prominent place in the ranks of pure science and speculative philosophy. The remarkable breadth of his mind and the abundance of his energies were also illustrated by the active part he played in public matters connected with the progress of science. His munificent gifts in the cause of education, as much as his achievements in science, had brought him a popular reputation of the best kind; and his public utterances in connection with smoke abatement, the electric light. Electric railways, and other topics of current interest, had rapidly brought him into a foremost place among English scientific men. During the last years of his life, Siemens advanced from the shade of mere professional celebrity into the strong light of public fame.
President of the British Association in 1882, and knighted in 1883, Siemens was a member of numerous learned societies both at home and abroad. In 1854 he became a Member of the Institution of Civil Engineers; and in 1862 he was elected a Fellow of the Royal Society. He was twice President of the Society of Telegraph Engineers and the Institution of Mechanical Engineers, besides being a Member of Council of the Institution of Civil Engineers, and a Vice-President of the Royal Institution. The Society of Arts, as we have already seen, was the first to honour him in the country of his adoption, by awarding him a gold medal for his regenerative condenser in 1850; and in 1883 he became its chairman. Many honours were conferred upon him in the course of his career—the Telford prize in 1853, gold medals at the
