DEWEY, Frederic Perkins, chemist, born in Hartford, Connecticut, 4 October 1855. He was graduated at the Sheffield scientific school in 1876, and in the autumn of that year became assistant in analytical chemistry in Lafayette College. This office he held until July 1877, when he took charge of the chemical work of the North Jersey iron company, and continued as such until the spring of 1878, after which he worked in the laboratory of the Sheffield scientific school as a postgraduate. In April 1879, he became chemist of the Roane iron and steel company, and in 1881 was associated with Dr. George W. Hawes in investigating the building stones of the United States for the Tenth Census. He was appointed in December 1882, curator of metallurgy in the U. S. national museum in Washington. His literary work includes articles on the chemical examination of iron and iron ores, contributed to various scientific journals; also, " The Chemical Examination of Building Stones," for the Tenth Census report, a" Biographical Sketch of Dr. Hawes." for the Smithsonian report. He prepared a "Plan to Illustrate the Mineral Resources of the United States and their Utilization" at the World's Industrial and Cotton Centennial Exhibition of 1884'5 in New Orleans.