left to right: Edwin Emery Slosson (1865-1929) and May Gorslin Preston Slosson (1858-1943), 1927, Smithsonian Institution Archives, left to right: Science Service director and chemist Edwin Emery Slosson (1865-1929) and May Gorslin Preston Slosson (1858-1943). Watson Davis took this photograph at a British Association for the Advancement of Science meeting in 1927..