Lastly. I have to thank many friends generally for their constant kindness and readiness to assist in any way, and in particular several for the most generous and valuable help in certain parts.
Mr. T.A. Archer, besides the benefit of his suggestions throughout, has given special aid in Chapters I., III., V., and the Introductory Chapter, especially where anything is said of the connection of geographical progress with the Crusades.[7]
Mr. F. York Powell has revised Chapter II. on the Vikings, and Professor Margoliouth has done the same for the Introductory Chapter on Greek and Arabic geography; Mr. Coote has not only given me every help in the map room of the British Museum, but has read the proofs of Chapter V. Mr. H. Yule-Oldham in Chapter XVIII. on the Voyage of Cadamosto, and Mr. Prestage in Chapters VIII. and IX. on Prince Henry's capture of Ceuta and settlement at Sagres, have been most kind in offering suggestions. For several hints useful in Chapter I.—the early Christian pilgrims—I have also to thank Professor Sanday; and for revision of a great part of the proof-sheets of the entire book, Mr. G.N. Richardson and the Rev. W.H. Hutton.
As to the illustrations, of portraits and monuments, etc., I am especially obliged to the Vice-Chancellor of Oxford University (Dr. Boyd), who has allowed his water-colour paintings of Portuguese subjects to be reproduced; and to the Rev. R. Livingstone of Pembroke, and Sir John Hawkins of Oriel, for their loan of photographs.
Prince Henry The Navigator.
The Lusitanian Prince who, heaven-inspired,
To love of useful glory roused mankind,
And in unbounded commerce mixed the world.