He served as a member of the jury for chemical products of the English section of the French Exhibition of 1878, and was made an officer of the Legion of Honour, and in 1889 a corresponding member of the French Institute of the Academy of Sciences. He was an honorary member of the American Philosophical Society of Philadelphia and of the New York Academy of Sciences; of the Chemical Society of Berlin; of the Bunsen Gesellschaft, of the Verein für Naturwissenschaft of Brunswick, and of the Physikalische Verein of Frankfort; a corresponding member of the Bavarian Academy of Sciences of Munich, of the Royal Society of Sciences of Göttingen, of the Royal Accad. Lincei of Rome, and of the Academy of Natural Science of Catania; a member of the Leop. Carol. Akad. of Halle, and of the Physiogr. Sällsk of Lund. He was an honorary member of the Royal Irish Academy, and of the Literary and Philosophical Society of Manchester. In 1912 the Franklin Institute awarded him the Elliott Cresson Gold Medal. He was sworn of the Privy Council in 1909—an honour which he accepted not only as a personal distinction but as a recognition of the claims of Science. But of all the distinctions and marks of appreciation he received in the course of his long and busy life, none afforded him a truer or more heart-felt gratification than the action taken by his old pupils in celebrating the fiftieth anniversary of the date—March 25, 1854—on which he took his Heidelberg degree. The warmth and cordiality with which the idea of commemorating his jubilee was received, not only by his former students but by every teaching institution, academic body, and scientific society with which he was or had been connected, was a striking testimony to the regard and esteem in which he was universally held. The University of Heidelberg renewed its diploma of Doctor Philosophiæ Naturalis, and accompanied it by an address from the Grand Duke of Baden, Rector of the University, the Pro-Rector, Senior Dean, and the other professors of the Philosophical Faculty. Addresses were also sent by University College, London, the Victoria University, and the Universities of London, Liverpool, Birmingham, Wales, Scotland, Montreal, Melbourne, New Zealand, and Tokyo; King’s College, London, the Yorkshire College, and the University Colleges of Sheffield, Newcastle, and Dundee; the Royal and Chemical Societies, the Society of Chemical Industry, British Association, the Lister and Pasteur Institutes, and a number of the academies and scientific societies of Germany, Italy, Holland, and America. In addition a large number of congratulatory letters and messages were received from distinguished friends, chemists, and physicists throughout Europe, America, and the British Dominions beyond the Seas.