SCIENTIFIC AND INDUSTRIAL SOCIETIES: American Chemical Society, Detroit Meeting; Program of the Fortieth General Meeting of the American Chemical Society Held at Detroit, Michigan; American Institute of Chemical Engineers; Twenty-Sixth Annual Convention of the Association of Official Agricultural Chemists; Seventh International Congress of Applied Chemistry London, May 27th, to June 2nd, 1909; Abstracts from the Seventh International Congress of Applied Chemistry, London, 1909.