TOPHAM, W. H., Explorations by, 73, 74 --, Reference to map by, 177 TORNADOES, Results of, 50 TRADE, South American, 23 TRIANGULATION, Commencement of, 86 TUCKER, J. RANDOLPH, Remarks by, at field meeting, x TUNNELS, Ice, 184 TYNDALL GLACIER named, 73 TYNDALL, J., cited on marginal crevasses, 127 VAN BEBBER, A., Reference to work of, 47 VANCOUVER, CAPTAIN GEORGE, Explorations by, 66, 68 VERATRUM VIRIDE, Mention of, 114 VOLCANOES of the Andes, 2 WARD, LESTER F., Report on fossil plants, 199, 200 WAXEL, SWEN, Quotations from, on de l'Isle's map, 223 --, Translations from letter by, 224 --, Work of, 222 WHITE, THOMAS, Member of expedition, 76 --, Work of, 158, 160 WILLIAMS, C. A., Contribution to exploration fund by, 75 WILLIAMS, WILLIAM, Explorations by, 73, 74 WILLIS, BAILY, Contribution to exploration fund by, 75 WILSON, H. M., Record of communication by, ix YAKUTAT BAY, Arrival at, 79 --, Base camp on western shore of, 86, 89 --, Shores of described, 57 --, Synonomy of, 56 YAKUTAT INDIANS described by Dixon, 61 -- system, Description of rocks of, 167 -- -- named, 131