INDEX. 
Theories concerning Great Pyramid, 
li., 114-116 
etc., of virus, v., 204-213 
of musical sand, x., 33 
Theory of the origin of leaf forms, 
iii., 38-44 
Thetis’ hairstone, vili., 161 
Thinnfeldia, xii., 33 
Thin sections of rocks, i., 49-53, 154 
Thiophene, v., 195 
Thompson, Prof. W. Gilman, elected 
resident member, xiv., 93 
J. P., elected corresponding mem- 
ber, xiil., 23 
Thorium phosphate, viii., 8 
Thousand Islands, diabase dikes of, 
xili., 213 
Thread-fins, ix., 15 
Thrush, new species, vi., 111 
Thuja, v. 136; vi., 126 
occidentalis, v., 218 
Thulium, y., 181-200 
Thurberia Arkansana, vii., 14 
Thymolesulpho acid, i., 3 
Tides, cause of, viii., 187 
high, erosion by, i., 80-85 
‘“ Tide-water ’’ gneiss, v., 19, 20. 222 
Tideways of Puget Sound, origin of, 
iii., 104 
Ties, iron, railway, v., 152 
Timber, decay in, v., 110-120 
Time, standard of, v., 236 
signals, v., 158 
system for observatories, v., 158- 
162 
international, i., 86-95 
rate in chemical] affinity, v., 188, 
189 
Timmins, Mr. Samuel, viii., 23 
Tin deposits of Black Hills, Dakota, 
iv,, 44 
indications of, ii., 100 
in San Juan Mts., v., 128 
mining in Cornwall, viii., 149 
of Australia, vili., 147 
of California, viil., 150 : 
of Dakota, vili., 146, 148, 150 
of East Indies, viii., 149 
of Mexico, viii., 150 
of North Carolina, viii., 136-151 
Titanichthys, v., 27 
Agassizti, v., 27 ; vi., 164, 165 
Clarkii, vi., 164, 165 
Titanium in iron-ores, ii., 7, 14, 17 
TRANSACTIONS N. Y. ACAD. ScI., Vol. XY., Sig. 24, Jannary 22, 1897. 
361 
Titanotheresin Am. Museum, xv., 66 
skull structure, xiv., 62 
Titanotherium and Metamyodon 
skeletons in Am. Mus., xv., 40 
Titanite, i1., 24 
yellow (gem), vili., 21 
Toltec images, ix., 97 
Toluca, meteorite, vi., 70 
Tombstones, durability of, ii., 75 
Tonquieria splendens, ii., 92 
Top, autograph of, vi., 135 
Topaz, ii., 25, 42, 100; iii., 2, 13, 
37; ix., 149 
from Colorado, v., 213 
from Texas, xii., 96 ; xiv., 144 
North American, vili., 160 
Topographical map of State, prepa- 
ration of, xiv., 91 
Topography of Egypt, iii., 78, 79 
of North America, ili., 51-52 
Tornadoes, iii., 3-5 
Torpedoes, xii., 151 
Torrey Botanical Club, Field Day, 
iv., 5 
Tourmaline, i., 2, 101; ii., 25; iii1., 
34, 49 ; v., 74, 80, 121, 222, 264, 
266)5) Vity) (des ey-t nO 
black, from St. Lawrence Co., N. 
Ye, ivan! 
crystals from Rudeville, 
xili., 185 
Toxopneuestes, xiv., 185 
fertilization, phenomena of, xiv..99 
Trachelomonas, 1x., 33 
Trachosteus, xii., 70 
Trachyte, i., 19,.23, 169; 1i-, 94 
in San Juan Mts., v., 122-130 
Track inspection car, iv., 5 
Tracks, in Triassic, vi., 125 
Tradescantia Virginica, ix., 182 
Tragia ramosa, vii., 14 
stylaris, vii., 14 
Trogophleus, vili., 41 
Trance, treatment of sea sickness, 
li., 64-66 
state, artistic uses of, iii., 107 
Transactions, vi., 66 
price of, x., 1 
Transformation of peat, i., 71-76 
of skin, vi., 113 
Transit factors for Observatory of 
Columbia College, xi., 41 
observations by least squares, re- 
duction of, x1., 25 
NES 
