APPENDIX, 



CONTAINING A DETAILED DESCRIPTION OF THE 

 REEFS AND ISLANDS IN PLATE V. 



In the beginning of the last chapter I stated the principles 

 on which the map is coloured. There only remains to be 

 said, that it is an exact copy of one by M. C. Gressier, 

 published by the D£pot general de la Marine, in 1835. 

 The names have been altered into English, and the 

 longitude has been reduced to that of Greenwich. The 

 colours were first laid down on accurate charts, on a large 

 scale. The data, on which the volcanoes historically known 

 to have been in action, have been marked with vermilion, 

 were given in a note to the last chapter. I will commence 

 my description on the eastern side of the map, and will 

 describe each group of islands consecutively, proceeding 

 westward across the Pacific and Indian Oceans, but ending 

 with the West Indies. 



The Western Shores of America appear to be entirely 

 without coral-reefs ; south of the equator the survey of the 

 Beagle^ and north of it, the published charts show that this 

 is the case, Even in the Bay of Panama^ where corals 

 flourish, there are no true coral-reefs, as I have been 

 informed by Mr. Lloyd. There are no coral-reefs in the 

 Galapagos Archipelago, as I know from personal inspec- 

 tion ; and I believe there are none on the Cocos, Reviila- 

 gigedo, and other neighbouring islands. Clipfierton rock, 



