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viii granted me when examining the Fell railway in 1869. From the Rev. T. G. Bonney (of St. John's Coll., Cambridge), and Mr. Rob. H. Scott, F.R.S., I have received many friendly hints and much valued criticism; and aid, in a variety of ways, from Mr. Budden, Prof. Gastaldi and Sig. Giordano, in Italy; from M. Emile Templier and the Maréchal Canrobert, in France; and from Mr. Gosset of Berne. I am indebted to Mr. William Longman for being allowed to reproduce the Ascent of Mont Pelvoux and three of its accompanying illustrations, and to the Messrs. Longman for the use of a portion of their map of the Western Alps; to the English Alpine Club for the use of a part of Mr. Reilly's map of the Valpelline and Val Tournanche; and especially to the Federal Council of Switzerland for having granted the unusual favour of a transfer from two of the valuable plates of the Dufour map. The two remaining maps are original. That of Mont Blanc is based upon the Government maps of France and Switzerland, and the survey of Mr. Reilly; and that of the Matterhorn and its glaciers (excluding some corrections which I have taken the liberty of making) is an enlargement of a portion of the Dufour map.

, May 1871.