Autograph Letter Signed, to Thomas Twining, about their engagement, asking whether he as “tried to effect a combination withe the South Kensington Museums”, congratulating Twining on his energy. A good one page example, 7 x 4½ inches. 9 Fitzroy Square, 22 May 1859. August Wilhelm von Hofmann (1818-1892), German chemist. The Hofmann voltameter is an apparatus for electrolyzing water. Hofmann’s work covered a wide range of organic chemistry. His first research, carried out in Liebig’s laboratory at Giessen, was on coal-tar and his investigation of the organic bases in naphtha established the nature of aniline. Hofmann studied under Justus von Liebig at the University of Giessen. When, in 1845, a school of practical chemistry was started in London, under the style of the Royal College of Chemistry, Hofmann, largely through the influence of the Prince Consort, was appointed its first director. The College was a success, owing largely to his enthusiasm and energy, and many of the men who were trained there subsequently made their mark in chemical history. In 1864 Hofmann returned to Bonn.