THE BEGETTER of this book is, in a real sense, Mr Michael Huxley, Editor of The Geographical Magazine, to whose enthusiasm and craftsmanship the articles from which it is developed owed their birth and form. I wish to express my grateful appreciation of his encouragement and help, and particularly of the editorial skill which he devoted to the selection of the illustrations and to the planning of their layout. In this connection I would also thank Mr Derek Weber, Art Editor of the Magazine. I am further indebted to Mr Huxley for permitting the use of the blocks which accompanied the original articles and without which no reprint could have been contemplated. In addition, he has allowed the use of some blocks which illustrated two articles on "Explorers' Ships", by Mr George Naish and myself, published in The Geographical Magazine in December 1956 and January 1957; and Mr Naish has kindly authorized me to incorporate in this book a few short passages from those articles.
My thanks are due to my wife, for her forbearance and candid criticism; to Dr Helen Wallis, for valuable advice; and to many scholars whose works on the history of exploration and of cartography I have consulted with profit.
For permission to reproduce maps in their custody I am indebted to the Trustees of the British Museum, the Deputy Keeper of the Records, the Hydrographer of the Admiralty, the Benchers of the Middle Temple, the Royal Geographical Society, the Hakluyt Society, the School of Oriental and African Studies ( London), the Real Academia de la Historia ( Madrid), the Duke of Alba, Messrs Martinus Nijhoff ( The Hague), the John Carter Brown Library ( Providence, R.I.), and the Free Public Library of Philadelphia.
April 1958 R. A. S.