gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1901.013.59.07 A Simple Proof of the Rationality of the Anharmonic Ratio of Four Faces of a Zone Hilton Harold B.A. Fellow of Magdalen College, Oxford

(Communicated by Prof. H. A. Miers.)

 5 1901 13 59 69 70 Copyright © 1901, The Mineralogical Society 1901