318 
Erosion of caves, i1., 3-6, 39-40 
of glacial, in North America, iii., 
51-52 
of continents, v., 78 
of the Alleghanies, viii., 149 
Git) 
Errata, x., 121 
Error of clocks, v., 153-154, 158-162 
Erubescite, vii., 217 
Eruption of Krakatoa, viii., 82, 83 
Eruptive Rocks, v., 121-130, 222,230 
from Colorado, vii., 16 
Vea: 
Ervilia, ix., 34 
Erythrea Beyrichii, ix., 185 
Erythrite, viii., 59 
Eschara digitata, ii., 12 
Eskimo period, iii., 10 
Esquimaux use of iron, v., 227 
Essex township, Geology of, xili., 214 
Essonite, v., 75 
from Delaware, vii., 225 
Vil., 212, 225 
Estheria ovalis, v., 17 
Eta Cassiopeiz, Parallax of, xiv., 87 
Etcheminian series, older than St. 
John’s group in New Brunswick 
and Newfoundland, xiv., 105 
subgroup, xiv., 194 
Ether, luminiferous, v., 77 
solidification of, v., 191 
Ethnological research, ix., 2 
Ethnology, section of, x., 109 
Ethylene, v., 191 
Ettringite, xii., 70 
Eubalena Sieboldii, i., 147 
Eucalyptus, vii., 67; xii., 236 
Geinitzi, xii., 31, 34 
Minoo 
Euglena, ix., 34 
Eunotia, xii., 220; xiii., 101 
Eupatorium Greggii, vii., 10 
incarnatum, vii., 10 
Euphorbia, xii., 38 
melanodenia, vii., 13 
Peplidion, vii., 13 
campestris, vili., 79 
Pringlei, viii., 79 
albomarginata, 1x., 181 
angusta, ix., 185 
Susxifolia, ix., 185 
Fendleri, ix., * 185 
Preslii, 1x., 185 
Serpeno, ix., 185 
INDEX. 
Wrightii, ix., 185 
Euphorbiacez, vii., 13 
Euplotis, ix., 34 
Eurite, viii., 49 
Eurypterid, new,from Catskill group, 
lie, 
Eurypterus, xii., 241 
Eutermes, viii., 87-97, 104-114 
nests of, viii., 88-95 
ravages of, vili., 90-93, 99, 100 
‘*soldiers,’’ viii., 90, 95, 104-111 
ix., 159 
Eutherian mammals, 
xlii., 175, 234 
Euxenite, vili., 159 
Evax multicaulis, ix., 181, 182 
Evening Post, vil., 254 
Events of the year, vii., 130 
Bigs noes s of subsidence and eleva- 
tion, x., 18 
Ey bilan, vii., 158, 162 
conception of species as modified 
by xiii., 132 
Discussion of causes, Xili., 156 
of head, vi., 135 
of horns, xiv., 62 
requiring neither natural selection 
or acquired characters, xv., 148 
in shells, vili., 114, 115 
of solar system, v., 249 
of the horse, xi., 107 
of the teeth, xii., 187 
of vertebrate, ii., 64 
Excavating power of glaciers, i., 2-30 
in ancient mounds, ix., 199 
Exchange list, vii., 131, 133; xii 
Exchanges, vi., 167-182 
Excretory sy stem and origin of pig- 
ment in Nephelis and Clepsine, 
Sas LOU 
Exhaustion of soil in America and 
Cuba, iii., 16-17 
Exhibition of Spanish chestnuts, xi., 
13 
Exogyra, Xii., 225, 226 
Exogyra costata, 1i., 10 
Expeditions to Florida and Georgia, 
vi., 60-65 
Experiments on durability of sand- 
stones, ii., pa 
in electricity, v. 89-110 
on the peer of the egg, xiii., 
206 
Exploration of America, xi., 60-65 
division of 
