322 
Galenite, ili., 2, 23 
Galicitis, xii., 51 
Galiwm virgatum, vii., 10 
Wrightii, viii., 80 
microphyllum, viii., 80 
Gallium, v., 183 
Galvanometer method of measuring 
alternating currents with, xy., 35 
Game-laws, vili., 36 
Gammarus, ix., 33 
Garbett, Mr. Samuel, viii., 24 
Garden, sea, x., 5 
Garnet from New York Island, ii., 
9, 18 
Aplome, iv., 42; v., 75, 263-265 
Almandine, y., 80, 265-266 
Asteriation in, v., 225-226 
from Colorado, v., 265-266 
green, from New York, v., 121 
large, from New York, vy., 80, 265- 
266 
in North Carolina, v., 222, 266 
Garnet, viii., 59, 153, 161 
Garnets, origin of, ix., 32 
Garnets, x., 50 
Garnetiferous schist, vili., 48, 49 
Garrya Fremontii, vili., 76 
Gas-analysis, improved method, ii., 
101-102 
Gas Film condensed in the surface of 
solid bodies with relation to 
(1) Newton’s rings of first order, 
(2) Sand flotation, 
(3) Sand in harmonic vibration, 
xv-, 97 
Gases, liquefaction of, v., 190-191 
Gasteropoda of Protolenus Fauna, 
xiv., 151 
Gasteropods, from streets of Hart- 
ford, iii., 20 
Gaura coccinea, ix., 184 
Drummondii, vii., 9 
Sinuata, vii., 9 
tripetala, vii., 9 
Gauss and Weber, memorial to, xii., 
2 
Gay Head, 
Geikie on decay of marble, ii., 
133 
Gems from Ceylon, ili., 17, 107 
the nu and cutting of, iv., 58 
of the U.S. 2 viii., 160-162 
Artificial, , 155 
Tiffany, eolleniaa of, ix., 151 
Mass., deposits at, iv., 78 
132- 
INDEX. 
Genealogy of mammalia, v., 89 
Genesis of crystalline iron ores, ii., 
6, 8, 13-17 
Genetic Relations of certain minerals 
of Northern N. Y., xv., 260 
Genth, F. A. death of, xii., 93 
Geodes of chalcedony, ii., 9 
Geodetic Survey, U. S., iv., 1 
Geological age, etc., of the Potomac, 
Group, x., 36 
Geological age of North Atlantic 
Ocean, v., 77-79 
Congress at Berlin, v., 20-25 
Notes in Virginia, etc., v., 215-223 
Geological climate, alternations of, 
iil., 94-96 
in high latitudes, iii., 84-97 
Geological Magazine, vi., 164 
Maps, viii., 47, 129, 130 
Survey of Illinois, ix., 132 
Geological Section of East 
Tunnel, xiv., 64, 273 
Geological Section, xy., 3, 50, 70, 
143, 153, 182 
Geologic time, length of, vi., 41 
Geologists in Philadelphia, xi., 45 
Geology of the Adirondacks, xii., 19 
Geology of the Bahamas, x., 4 
Geology of country traversed by 
Northern Pacific Railroad, i11.,56 
of Porcupine Mountains, iii., 14 
of vicinity of Golden, Col., iii., 77 
of Yellowstone Park, iii., 34 
Geology of Essex and Willsboro 
Townships, Essex Co., N. Y., 
xili., 214 
North Shore of Long Island, xiii., 
122 
Ulster Co., N. Y.,° xiii., 165 
of Gouverneur, N. Y. -» Xii., 97 
of Long Island, iv., 25 
River 
Northern Montana., ae 
of North Carolina, Mitchell’s, Slee 
45 
of Skunnemunk Mountain, xi., 132 
Wm. Maclure’s, xi., 45 
of Texas and Chihuahua, ii., 66, 
94-95 
Georgia, Minerals from, iii., 13 
Geostilbia, i1., 152 
Geraniacex, vii., 8 
Geranium Carolinianum, vii., 8 
cespitosum, vill., 79 
Germany, state forests of, vili., 32 
