Citation: Wyckoff, R. W. G. (1935). Page 64 from the second edition supplement of The Structure of Crystals by Wyckoff R W G. published by Reinhold Publishing Corporation, INC,Camden,N. J. in 1935 and page 285 from the second edition of Structure of Crystals by Wyckoff R W G.published by The Chemical Catalog Company, INC, New York in 1931. The second edition supplement of The Structure of Crystals, , pp. 64-64.