BORUNDUM; OZONE; etc., which will be found under their respec tive titles.
works: A. J. Allmand and H. J. T. Effing ham, The Principles of Applied Electrochemistry (1924) ; H. J. M. Creighton and C. G. Fink, Principles and Applications of Electro chemistry, vol. i. (New York, 1924) ; M. de K. Thompson, Theoretical and Applied Electrochemistry (New York, 1925) ; J. N. Pring, The Electric Furnace (1921) ; F. Foerster, Elektrochemie wiisseriger Losungen (Leipzig, 1923). (H. J. T. E.)