I have to thank several of my friends, and in particular Professor Bonney, Professor Garwood, and Dr. Mill, for their help with respect to the chapters devoted to de Saussure's scientific work and achievements. To the published works of the Rev. W. A. B. Coolidge and Dr. Diibi I have made frequent reference, and the latter has further aided me with his friendly advice. Mrs. Rathbone has kindly allowed me to reproduce the drawing of Mont Blanc made by Mr. E. T. Compton for her father, my old friend, the late C. E. Mathews. Among the descendants of H. B. De Saussure and the members of old Genevese families who have been good enough to place at the disposal of my collaborator papers from their family archives.
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