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I am also indebted to the firms which presented supplies of various sorts, and to the manufacturers who so readily assisted in the matter of ensuring the highest quality and purity in our foods. As regards the production of this book, I am in debted to Dr. Hugh Robert Mill for the introduction which he has written to Mr. Edward Saunders, of New Zealand, who not only acted as my secretary in the writing of the book, but bore a great deal of the labour, advised me on literary points and gave general assistance that was invaluable; and to my publisher, Mr. William Heinemann, for much help and many kindnesses. I have to thank the members of the expedition who have provided the scientific appendices. I should like to make special mention of Professor T. W. Edgeworth David, who has told the story of the Northern Journey, and Mr. George Marston, the artist of the expedition, represented in this volume by the colour-plates, sketches and some diagrams. I have drawn on the diaries of various members of the expedition to supply information regarding events that occurred while I was absent on journeys. The photographs with which these volumes are illustrated have been selected from some thousands taken by Brocklehurst, David, Davis, Day, Dunlop, Harbord, Joyce, Mackintosh, Marshall, Mawson, Murray and Wild, secured often under circumstances of exceptional difficulty.
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