"Number 4, represented by three or four very fine specimens, is a very large leaf, measuring 13 cm. in length and 3½ cm. in width at the broadest point. It may be compared with _Salix macrophylla_, Heer,[42] but it cannot be this species. It is also like some of the living forms of _S. nigra_, Marsh., from which it differs in having perfectly entire margins. "While it is manifestly impossible, on the basis of the above identifications, to speak with confidence as to the age or formation containing these leaves, it can hardly be older than the Miocene, and from its strong resemblance to the present existing flora of Alaska it is likely to be much younger." [F. H. Knowlton.] Very sincerely yours, LESTER F. WARD. [Footnote 38: Mem. Mus. Comp. Zool., vol. VI, no. 2, 1878, p. 10, pl. i, figs. 18-21.] [Footnote 39: Flor. foss. Arct., vol. I, 1868, p. 102, pl. iv, figs. 11-13; pl. xlvii, fig. 11.] [Footnote 40: Proc. Nat. Mus., vol. V, 1882, p. 447.] [Footnote 41: loc. cit., pl. viii, fig. 6.] [Footnote 42: Tert. Fl. Helv., vol. II, 1856, p. 29, pl. lxvii, fig. 4.] {201} INDEX. Admiralty bay, 56 Agassiz glacier, Ascent of, 147 -- -- named, 73 Age of St. Elias range, 175 Alpenstocks, Necessity for, 165 Alpine glaciers, 176, 180 Alton, Edmund, Contributions to exploration fund by, 75 _Archangelica_, Mention of, 89, 114 _Atrevida_ (The), Mention of, 63 Arevida glacier, 92, 105 Auriferous sands, 196, 197, 198 Avalanches, 145, 155 Baie de Monti, 56 -- named by La Pérouse, 60 Baker, Marcus, Explorations by, 70, 72 -- reference to bibliography by, 58 Base Line, Measurement of, 86 Bear, Meeting with, 94, 109 Belcher, Sir Edward, Explorations by, 68, 69 Bell, A. Graham, Contribution to exploration fund by, 75 Bell, Charles J., Contribution to exploration fund by, 75 Bering bay, Mention of, 56 Bering, Vitus, Explorations by, 58 Bien, Morris, Contribution to exploration fund by, 75 Birnie, Jr., Rogers, Contribution to exploration fund by, 75 Black glacier, Brief account of, 101, 104 Blossom island, Description of, 113, 122 Boursin, Henry, Mention of, 79 Broka, George, Explorations by, 73, 74 Camp hands, 166 Carpenter, Z. T., Contribution to exploration fund by, 75 Carroll, Captain James, 78 Cascade glacier named, 144 Chaix hills named, 73 Chariot, The, Mention of, 140 Chatham, Mention of, 66 Cherikof, Alexei, Explorations of, 58 Christie, J. H., Member of expedition, 76 -- Work of, 82, 83, 84, 96, 103, 112, 113, 123, 162 Clover, Richardson, Contribution to exploration fund by, 75 Cook, Captain James, Explorations of, 58 _Corwin_ (The) in Disenchantment bay, 100 -- Return of, 163 Crevasses, 181, 182 -- at Pinnacle pass, 130 Cross sound, visited by Vancouver's expedition, 67 Crumback, J. H., Member of expedition, 76 -- Work of, 96, 103, 122, 125, 129, 131, 135, 137 Dagelet, M., Mention of, 60 Dall, W. H., Explorations by, 70, 72 -- reference to bibliography by, 58