CHAPTER XIII. See Chapter in Cressy's "discoveries and Inventions of Twentieth

See chapter in Cressy's "Discoveries and Inventions of Twentieth Century." "Oxy-Acetylene Welders," Bulletin No. 11, Federal Board of Vocational Education, Washington, June, 1918, gives practical directions for welding. Reactions, a quarterly published by Goldschmidt Thermit Company, N.Y., reports latest achievements of aluminothermics. Provost Smith's "Chemistry in America" (Appleton) tells of the experiments of Robert Hare and other pioneers. "Applications of Electrolysis in Chemical Industry" by A.F. Hall (Longmans). For recent work on artificial diamonds see Scientific American Supplement, Dec. 8, 1917, and August 24, 1918. On acetylene see "A Storehouse of Sleeping Energy" by J.M. Morehead in Scientific American, January 27, 1917.