INDEX. 
Coral islands, lagoons, origin of, 123, 130. 
logs floated to, 77. 
loose or attached coral blocks on, 
61. 
plants of, 78. 
shore platform, 59, 60, 65, 109. 
sandhills on, 64. ‘ 
soundings around, 55. 
stones carried to, on logs, 77. 
structure of, 57. 
water on, 76. 
Coral reefs, general features of, 33, 35, 36, 
distribution of, how limited, 134, 
136. 
effect of rivers on, in Feejees, 341, 
342, 
or islands, evidences from, of ele- 
vation, 248, 251, 351, 402. 
evidences from, of subsi- 
dence, 393, 394. 
mode of formation of, 108, 108. 
rate of growth of, 121. 
barrier and fringing, 33. 
of north shore of Tahiti, 41. 
fringing, not necessary evidence 
of no subsidence, 394. 
inner, 38, 
outer, characters of, 36. 
nullipore accumulations on, 
37. 
channels within barriers, 40. 
ibid., origin of, 123. 
causes of passages through, 
114. 
thickness of, 46. 
harbours of, 114. 
windward highest, 113. 
geographical distribution of, 134. 
of Pacific Ocean, 137. 
of African coast, 145. 
of East Indies, 142. 
Feejee Group, 34. 
of Indian Ocean, 145. 
Coral reef seas, limits of, 135, 146. 
Coral mud, 107, 149. 
Coral rock or limestone, 37, 39, 57, 67, 147, 
322, 
739 
Coral rock or limestone of beach origin, 39, 
43, 45, 64, 149, 253, 277. 
of Matea, analysis of, 153. 
often destitute of fossils, 38,46,149. 
affording mineral fluorids, and 
phosphates, 152. 
in tufa craters, 244, 328. 
Coral sand, cementation of, 44, 153. 
Cotopaxi, character of summit of, 356. 
Couthouy, J. P., elevation of Clermont Ton- 
nerre, 403. 
isthmus on Tahiti, 294. 
oncorals on the declivities of Tahiti,300. 
soundings of Lanu To’o, 321. 
Craters, kinds of, on Hawaii, 228. 
kinds of, in Pacific, 353. 
of eruption, 370. 
of elevation, 370. 
pit, of Mount Loa, 211, 224, 
tufa, origin of, 260. 
containing lakes, 218, 245, 320, 326. 
of large size, at the Canaries, 362, 
Crater of Kilauea, see Azlauea. 
see farther, Volcano. 
Crystallization in volcanic centres, 377, 378. 
Cunningham, W. C., on Rarotonga, 364. 
lava on Tutuila, 310. 
Curvatures in ranges of islands, 418. 
Curved ranges off the Asiatic coast, 419. 
of New Guinea chain, 421. 
Curved columnar structure, Tahiti, 297. 
basaltic columns, N. S. Wales, 508. 
on Kauai, 269. 
Cypricardia acutifrons, 702. 
arcodes, 702. 
imbricata, 702. 
prerupta, 703. 
rugulosa, 696. 
siliqua, 703. 
simplex, 703. 
veneris, 704. 
Dangerous Archipelago, see Paumotus. 
Dalyell, J. G., on the rate of growth of zoo- 
phytes, 102. 
Darwin, C., calcareous incrustations no- 
ticed by, 45. 
