The preparation of the illustrations has occupied a large part of my time during the last six years. With the exception of the views upon pp. 18, 19 and 24, the whole of the illustrations have been engraved expressly for the book, and, unless it is otherwise specified, all are from my own sketches. About fifty have been drawn on the wood by Mr. James Mahoney, and I am much indebted to that artist for the care and fidelity with which he has fol lowed my slight memoranda, and for the spirit that he has put into his admirable designs. Most of his drawings will be identified by his mono gram. Twenty of the remainder are the work of Mr. Cyrus Johnston, and out of these I would draw especial attention to the view of the Matterhorn facing p. 36, the striated rock upon p. 63, and the bits from the Mer de Glace upon pp. 138, 139. The illustrations have been introduced as illustra tions, and very rarely for ornamental purposes. We have subordinated everything in them to accuracy, and it is only fair to the artists who have honored me by their assistance to say that many of their designs would have ranked higher as works of art if they had been subjected to fewer restrictions.