INDEX. 
679 
Humboldt, Baron Alexander von, (see Preface,) his estimate of 
the height of Mount Bogdo, 195. 
1 his determination of the prin- 
cipal forms of the Ural Mountains, 338. 
1 his remarks on the difficulty 
of determining the western commencement of the Ural, 
354. 
, his conclusions with regard to 
gneiss and stratified granite, 435. 
, his opinion of the age of the 
auriferous alluvia of the Ural, 472. 
, his opinion that diamonds 
would he found in the Ural confirmed, 481. 
> his views of the rise of the Ural 
and Altai Mountains, 497. 
, his views on the ancient 
course of the Oxus, 577, 652. 
Hunneberg (Sweden), alum-slate seen at, 15. 
lluot, M., his division of the tertiary rocks in the Crimtea, 302. 
Hypothesis of the cause of the inversion of strata in the Ural, 
463. (Sec also Appendix, 646.) 
to explain the arrangement of the Scandinavian 
blocks, 528. 
Hyshifiol (Sweden), Silurian fossils from, 18*. 
Ice-caves, cause of the cold in, 187, 197. 
Ice, effect of, as a means of transport in modern times, 564, 565. 
. in forming ridges of gravel on the banks of lakes 
in Russia, 569. 
Icebergs, agency of, in depositing drift and transporting erratic 
blocks, 509, 521. 
considered with reference to their power in transport- 
ing drift, 528. 
of the Pacific referred to, 529. 
, their effect in grating and scratching the rocks over 
which they are forced, 533. 
, great probability of their ancient existence in Scandi- 
navia and Lapland, 537. 
, effect of, floating from Scandinavia, 554. 
Ice-floe, illustration of the melting of an ancient, 547. 
Ichthyoliles of Russian Devonian strata, new and remarkable 
genera of, 33. 
■ . note concerning M. 
Agassiz’s researches and M. Eichwald’s memoir on this sub- 
ject, 39*. 
of the lower beds of 
the Volkof differ from those in the upper strata of the 
A'aldai Hills on the Priutchka (Priksha), 44. 
on the eastern banks of 
Lake Onega near the mouth of the Andoma, 48. 
in Livonia, 51. 
on the Vol (Timan), 
414 . 
associated with Devo- 
nian Mollusca, 30*, 43, 60, 63. 
, their value in distin- 
guishing those beds from the underlying ones, 64. 
, comparative scarcity in Russian carboniferous 
strata, 133. 
Ichthyosaurus, fragments of, found in the Jurassic strata of 
Simbirsk, 258. 
Identity of the Devonian fossil fishes of Russia with those of 
the old red of Scotland, 66. 
Igneous eruptions around the Donetz coal-field, 92. 
— disturbances, effect of on the former bottoms of the 
Caspian, 324. 
rocks of the Ural mountains, 337 to 470. 
and palamzoic rocks of the Issetz, 363. 
— rocks, peculiar appearance of in the Katchkanar, 392. 
origin of the granitiform rocks of the Ilmen Hills, 436. 
rocks of the Guberlinski Hills, outline of 447. 
and metamorphic rocks of the axis of the South Ural 
described, 454. 
Ijema or Ishma, Jurassic shales surmounting carboniferous 
rocks at, 415, 417. 
Ik, concretionary masses of gypsum (Permian) with caverns in 
the valley watered by this river, 156. 
Ilek (Orenburg), fossil if erous siliceous grit of the Jurassic 
period on tire, 247. 
Ilctsk (Arctic Ural), encrinital limestone on the, 408. 
— — , thick beds of carboniferous limestone on the, 409. 
Uink (Tehussovaya), carboniferous limestone fossils at, 386. 
Illmius perovaHs of the Silurian system identical with I. cras- 
sicauda, 12. 
Illetzkaya-Zastehita (Orenburg), mass of rock salt and gypsum 
of the Permian age at, 145, 183, 184. 
, freezing cavern at, 186. 
■ > fossiliferous siliceous beds of the Jurassic 
period near, 247. 
Ilmen, Lake, the beds near, chiefly Devonian, 41. 
, cliffs of, near Korostino, contain Devonian fossils, 
44. 
, great thickness of the inferior strata developed to 
the south of, 45. 
Ilmen Hills (Minsk), extension of crystalline rocks to, 433. 
, granitiform ridges of, 435. 
Indersk, Lake, Jurassic rocks of, 193. 
, Mount, an isolated hill of red sand, marl, and lime- 
stone in the southern steppes, 192. 
, ice-caves said to exist there, 1.90. 
India, analogy between the cotton soil of, and the Russian 
tchornozem, 563. 
Indiga river, traverses the carboniferous limestone of the Ti- 
man range, 415. 
Inferior oolite, absence of, between Prussia and Asia, 256. 
Infusoria, remains of, in the Jurassic grits of Moscow, 241. 
Iukino, on the Oka, section of Jurassic rocks near, 233. 
, ironsand beds of, belong to the Moscow Jurassic series, 
242. 
Inocerarnus grits ( Avicnla v. Buell, hodie) characteristic of the 
Jurassic period in many parts of Russia, 237, 245. 
Intrusive rocks near Christiania, 13*. 
in Sweden, 15 et seq. 
along the North of Russia, 22*. 
of llochlaml in the Clulf of Finland, 24*. 
throughout the Ural mountains, 337 to 470. 
— of the North Ural, all on the same line of erup- 
tion, 380 et seq. 
Inversion of strata on the west flank of the North Ural, 386. 
on the east flank of tile South Ural, 424. 
at several places west of Zlataust, 430, 433, 
456. 
-> general view of, in the Ural, Alps, Ac., 463. 
in North Wales, 470. 
Ireland, examples of striated rocks and drift in, 549. 
Iremel or Ereinel (highest peak of South Ural), the geology of, 
according to Col. llelmersen and others, 421, 456. 
Irendyk (ridge ot the South Ural), M. Rose’s account of one of 
its broken prolongations, 447. 
ridge, account of a section across, 450. 
, peaks of ibis mountain ridge, view of, 453, 654. 
Iron, concretions of argillaceous ore of, at the mines of Lissit- 
cliia-Halka, 109. 
, the best ores of, obtained from the Ural, 110, 
worked on the cliffs of theUnjafrom the Jurassic roeks,234. 
sands, containing Oxfordian fossils, on the banks of the 
Oka, 242. 
, flourishing works of, near the eruptive rocks of Niini 
Serginsk (Ural), 356, 
, magnetic ores of, found at Nijny-Tagilsk (North Ural) 370 
, ores of, found at Bakaiski (South Ural), 429. 
-, chromate of, found in the South Ural, 438. 
Is, river (North Ural), Silurian fossils (Penlamerus near to P 
Kniyhtii) found on the banks of, 394. 
Isabelnoi, fort of, on the llek, osseous remains, probably Saurian, 
found in a siliceous Jurassic grit at, 247. 
