gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1977.041.320.38 J.F.W.Bowles: History of Fe₃O₄-FeTiO₃ Grains (App.) An Estimation of the Probable Errors of the Method of Tracing the Cooling History of Complex Magnetite-Ilmenite Grains and a Discussion of the Results Produced by Using Different Methods of Treatment of the Minor Elements Contained in These Minerals When Using the Buddington and Lindsley (1964) Geothermometer. (Appendix to “A Method of Tracing the Temperature and Oxygen-Fugacity Histories of Complex Magnetite-Ilmenite Grains”, This Vol. pp 103–109) Bowles John F W Department of Geology, University College London WC1E 68T Present address: Institute of Geological Sciences, 64/78 Gray's Inn Road London WC1X 8NG 12 1977 41 320 M16 M19 Copyright © 1977, The Mineralogical Society 1977