APPENDIX [I.] 
CONTAINING 
A DETAILED DESCRIPTION OE THE REEFS AND ISLANDS 
IN THE COLOURED MAP, Plate III. 
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, 
published by the Depot General de la Marine, in 1835. 
The names have been altered into English, and the longi- 
tude 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 consecutively, 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. Lloyd. There are no coral-reefs in the 
Galapagos archipelago, as I know from personal inspection ; 
and I believe there are none on the Cocos, Bevilla-gigedo, 
and other neighbouring islands. Clipperton 1 rock, 10° N., 
1 [Undoubtedly an atoll, according to Sir J. Belcher’s chart. — 
Captain Wharton.] 
