FRANK WIGGLESWORTH CLARKE, born on Mar. 19, 1847, at Boston, Massachusetts, was well known among inorganic chemists, mineralogists, and geologists in Great Britain. For mineralogists and geologists his “Data of Geochemistry” was a handbook full of invaluable information, not in other ways readily accessible, especially at the time of its first publication in 1908. In addition to his work directly related to geology and mineralogy, he did important work on atomic weights and thermochemical constants. He was chairman of the International Committee on Atomic Weights in 1900 president of the American Chemical Society in 1901, of the Washington Academy of Arts and Sciences in 1911, and of the Washington Philosophical Society in 1896. He was a foreign member of the Geological Society of London an honorary member of the Chemical Society, of the Mineralogical Society, and of the Manchester Literary and Philosophical Society and a corresponding member of the British Association and of the Geological Society of Edinburgh. He was given the honorary degree of D.Sc. by Victoria University, Manchester, and LL.D. by the University of Aberdeen.