INDEX. 
Hungary, minerals from, iii., 104 
opal mines of, xi., 32 
Hunt, Dr. T. Sterry, death of, xi., 
72 
Huntington, George S., elected resi- 
dent member, xii., 25 
Huxley’s bill to fix standard weights 
and measures, xv., 125 
Huronian, xiv., 194 
ion Ores, 155, 6,7, 17 
Huron, shale of Ohio containing Din- 
ichthys, iii., 20 
Huxley memorial committee, xv., 
39 
fund, xv., 132 
tribute, xv., 40 
Hyaline quartz, viii., 161, 162 
Hybrids and Hybridism, iv., 79 
Hydatina, ix., 33 
Hydnum septentrionale, v., 111 
Hydraulics of the Mississippi, ii1., 
82-83 
Hydrazoic acid, x., 43 
Hydriodie acid, v., 187 
Hydrochloric acid, v., 192 
solidification of, v., 191 
Hydrogen, v.. 185, 186, 187 
as primary matter, v,, 184-185, 
in comets, v., 255 
in stars, v., 184 
in sun, v., 245 
liquefaction of, v., 190, 191 
weight of atom of, v., 183 
peroxide of, v., 188 
Hydrodolomite, viii., 60 
Hydromica schist, viii., 48, 50, 53 
Hydrophane, vi., 111, 112; viii., 16, 
ily 
Hydroxyl, v., 186 
Hymenea, v., 137 
Hymenatherum, viii., 77 
Hymenatherum tenuilobum, vii., 11 
pentachetum, 1x., 182 
lenuilobum, ix., 182 
Hymenopappus Mexicanus, viil., 77 
flavescens, ix., 184 
Hyolithellus micans ? xiv., 129 
Hypolithes, ef. princeps, Americanus, 
obtusa, decipiens, gracilior, xiv., 
129 
Hyopotamus, xiii., 176 
Hypericum virgatum ovalifolium (new), 
im, 10 
Hypotricha, ix., 34 
327 
Ice age in North America, ix., 83 
caves in the Shawangunk Range, 
it., 23 
erosive power of, ili., 51-52 
movement, direction of, iii., 24 
crystals, x., 120 
eroding, power of, viii., 164 
period, theory of, ii., 157-159 
Iced-Bar and Long-Tape Base Appa- 
ratus, xili., 6 
Iceland, geysers of, viii., 184 
history of, viiil., 184 
people of, viii., 184 
scenery in, viii., 184 
spar, vili., 58 
Ichthyosaurus, v., 26 
Icterus Northropi (new), x., 52 
Idaho forests, i., 5 
mining, i., 4-5 
voleanic tufts, i., 49-50 
minerals from, iii., 2, 7 
Idocrase, ii., 25 
Idunium, v., 200 
Teneous rocks, v., 121-130, 222, 230 
Tleo-colic junction of Procyon lotor 
Xil., 50 
Iles, Mr. George, elected resident 
member, xiv., 93 
Illumination for Photo-Micrography, 
sources of, xiv., 71 
Ilmenite, vi., 130; viii., 54 
Tlysanthes gratioloides, ix., 185 
Imperfections in rock crystals, v., 
275-276 
Implement shed, i., 121, 147 
stone, i., 49, 85, 105 
Implements of argillite, iii., 9 
of flint of Amiens, iii., 80 
Incandesence, Temperature, iv., 43 
Inception and progress of railways, 
v., 137-152 
Inclusions in amber, viii., 156, 157 
in oligoclase, viii., 2 
in quartz, vili., 21, 161 
Index to Copernicus, x., 87 
Indian arrow heads near Trenton, 
iii., 8 
arrow heads in Oregon, iii., 63 
mythology of Sacramento Valley, 
lii., 55 
gold ornaments, vi., 40, 60 
mounds, vi., 40, 71, 72 
character, v., 203 
garnets, v., 225, 226 
9 
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