INDEX. 
91, 
Heidelberg, shells found in the loess at, 
152 
loess and gravel alternating at, 153 
granites of different ages near, 357 
Henslow, Professor, on the changes caused 
by a volcanic dike in Anglesea, 368 
Hibbert, Dr ., on the extinct volcanos of 
the Rhine, 197, 201 
■ on the loess of the valley of the 
Rhine, 151 
on the mammiferous remains of 
Velay, 219 
Highbeach, in Essex, height of the Lon- 
don clay at, 312 
Hoffmann, Professor, his examination of 
Sicily, 63 
— — on the limestone of Capo Santa Croce, 
68 
on the new island of Sciacca, 71 
on the Val del Bove, 88 
. on cave deposits in Sicily, 139, 140, 
Honduras, recent strata of the, 133 
Hornblende schist, altered clay or shale, 
373 
Horner, Mr. Leonard, his map of the vol- 
canic district of the Eifel and Lower 
Rhine — see wood-cut No. 48, 194 
on the geology of the Lower Rhine 
and Eifel, 201 
Hugi, M., on secondary strata altered into 
gneiss in the Alps, 372 
on modern granite in the Alps, 358 
Human remains now becoming imbedded 
in osseous breccias in the Morea, 144 
Humboldt, on the depression of a large 
part of Asia, below the level of the sea, 
29 
Hundsruck, beds and veins of quartz found 
in the mountains of the, 201 
Hungary, tertiary formations of, 212 
— — age of the tertiary strata of, 215 
volcanic rocks of, 222 
■ age of the igneous rocks of, 223 
Hutton, his opiuion as to altered sedimen- 
tary rocks, 382 
Huttonian hypothesis of the origin of 
gneiss, 366 
Hypogene, term proposed as a substitute 
for primary, 374 
i formations, no order of succession 
in, 375 
■ rocks, their identity of character in 
distant regions, 376 
— — produced in all ages in equal quan- 
tities, 377 
— — their relative age, 377 
volume of, formed since the Eocene 
period, 381 
Icebergs, rocks transported by, deposited 
wherever they are dissolved, 149, 150 
Idienne, volcanic mountain of, 252 
Indusial limestone of Auvergne, 232 
Inkpen Hill, the highest point of the chalk 
in England, 314 
Inland cliff near Dax — see wood-cut No. 
53, 209 
Inland cliffs on East side of Val di Noto, 
Ill 
Insects, fossil, of Aix, 277 
Ischia, volcanic conglomerates now in 
progress on the shores of, 73 
fossil shells of recent species found 
at great heights in, 126 
external configuration of, how caused, 
127 
list of fossil shells from— Appendix 
II., 57 
Isle of Bourbon, a volcanic eruption every 
two years in, 363 
Isle of Cyclops, in the bay of Trezza, view 
of — see wood-cut No. 14, 79 
■ its height, &c, 79 
stratified marl resting on columnar 
lava in the — see wood-cut No. 1 4, 79 
contortions in the newer Pliocene, 
strata of — see wood-cut No. 15, 80 
divided into two parts by a great 
fissure, 80 
newer Pliocene strata invaded by 
lava in — see wood-cut No. 16, 81 
lavas of, not currents from Etna, 81 
Isle of Purbeck, traversed by a line of ver- 
tical or inclined strata, 315 
Isle of Wight, geology of the, 18 
■ fall of one of the Needles of the, into 
the sea in 1772, 181 
fresh-water strata of the, 280 
mammiferous remains of the, 281, 
317 
vertical strata of the, 315 
Italy, tertiary strata of, 18 
age of the volcanic rocks of, 183 
number of living species in the fossil 
shells of — see Appendix I., 47 
number of those common to Sicily 
and, ib. 47 
number common to the Crag and, 
ib. 47 
number common to Sicily, the 
and, ib. 47 
Jack, Dr., on the geology of the island of 
Pulo Nias, 134 
Jamaica, fossil shells of recent species 
from, in the British Museum, 133 
Java, subsidence of the volcano of Papan- 
dayang, in the island of, 96 
i vegetation destroyed by hot sulphuric 
water from a mountain in, 252 
Jobert, M., on the extinct quadrupeds of 
Mont Perrier, 218 
on the hill of Gergovia, 258 
