197 



APPENDIX ; 



CONTAINING 



A DETAILED DESCRIPTION OE THE EEEFS AND ISLANDS 

 IN THE COLOURED MAP, Plate in. 



In the beginning of the last chapter I stated the principles on 

 which the map has been coloured. There only remains to be 

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

 lished by the Depot 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 volcanos 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 con- 

 secutively, proceeding westward across the Pacific and Indian 

 Oceans, and 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. LJoyd. There are no coral-reefs in the Galapagos archi- 

 pelago, as I know from personal inspection ; and I believe 

 there are none on the Cocos, Revilla-gigedo, and other neigh- 

 bouring islands. Clipperton rock, 10° N., 109° W., from a 

 drawing appended to a MS. plan in the Admiralty, does not 



