INDEX. 



Apatite in coral rock, 114. 

 Atoll, origin of the word, 6. 

 Analysis of corals and coral rock, 113. 

 of sea- waters, 58, 139. 



Barrier reefs, 6. 

 Basalt in coral islands, 45. 

 Beaches of coral islands, 28. 

 Beach formations, 15, 32, 110. 

 Beechy, elevation of Elizabeth and Osna 

 burgh Island, 128. 



remark on the Gambier group, 94. 



soundings near coral islands, 25. 

 Birgus, on coral islands, 37. 

 Birnie's Island, 131. 



Caroline Islands, 120, 125, 134. 

 Caverns in elevated coral islands, 35. 

 Cementation of coral sand, 66, 115, 140 



of pebbles, on Oahu, 66. 

 Chagos Bank, 37, 96. 

 Chalk, of coral origin, Oahu, 112. 

 Chamisso, depth of water at the Marshall 



Islands, 32, 

 Chondrodite, elements of, in coral rocks, 



114. 

 Christmas Island, 25, 130. 

 Clermont Tonnerre, elevation of, 128. 

 Cocoanut, uses of, on coral islands, 43. 

 Coral, causes influencing growth of, 59. 

 depth of, 62. 

 rate of growth of, 66. 

 secretion of, 46. 



influence of waves in breaking, 70. 

 texture and composition of, 55. 

 Coral animals, structure and growth of, 47. 

 Coral formations, on Oahu, 17, 132. 



not on the mountains of Tahiti. 

 128. 

 Coral chalk, 112. 

 Coral conglomerate, 11, 16. 

 Coral debris, formation of, 70. 



whether distributed over sea bot- 

 tom between coral islands, 117. 

 Coral field, character of, 69. 

 Coral islands, general remarks on, 6, 20, 57 

 description of the condition of, 

 when most complete, 43. 



Coral islands, distribution of, in the Pacific, 

 and proofs from, of changes of level, 

 119, 126. 



areas of several, 23. 



crater theory of, objected to, 87. 



description of several, 21, 36. 



emerged land of, 28. 



fissures in reefs of, 27. 



ship entrance to, 24, 84. 



soundings in, 31. 



logs, with stones floated to, 44. 



loose or attached coral blocks 

 on, 29. 



shore platform of, 27, 33. 



sandhills on, 32. 



water on, 44. 

 Coral reefs, general features of, 6, 79, 74, 



distribution of, how limited, 97. 



mode of formation of, 69. 



rate of growth of, 85. 



of north shore of Tahiti, 14. 



Nullipore accumulations on, 10. 



causes of passages through, 79. 



thickness of, 19. 



harbors of, 79. 



windward highest, 78. 



geographical distribution of, 97. 

 Coral reef seas, limits of, 77, 108. 

 Coral mud, 73, 111. 



Coral rock or limestone, 10, 15, 26, 32, 35, 

 110. 



of Matea, analysis of, 115. 



often destitute of fossils, 11, 18, 



112. 



and 



affording mineral fluorids, 

 phosphates, 114. 

 Coral sand, cementation of, 16, 115, 140. 



Dangerous Archipelago, see Paumotus. 

 Daly ell, J. GT., on the rate of growth of 



zoophytes, 66. 

 Darwin, C, calcareous incrustations noticed 

 by, 17. 



thickness of reefs, 19. 

 soundings near coral islands, 25. 

 depth of water at Keeling Island, and 

 on coral mud of, 24. 

 on the Maldives, 34, 96. 



