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APPENDIX. 
this island is in the close vicinity of other low islands, and 
as it is said that the natives make reservoirs of water in 
old cocoa-nut trees (which shows the nature of the land), I 
have no doubt it is an atoll, and have coloured it blue. — 
York Island (8° S., 172° W.) is described by Commodore 
Byron (chap: x. of his Voyage) as an atoll ; blue. — Sydney 
Island (4° S., 172° W.) is about three miles in diameter, with 
its interior occupied by a lagoon (Captain Tromelin, Annal. 
Marit. 1829, p. 297) ; coloured blue. — Hull Island is situ- 
ated 60 miles to the west of Sydney Island, and is described 
by Wilkes (U.S. Exploring Expedition, vol. iii. p. 369) as a 
lagoon-island ; coloured blue. — Phoenix Island (4° S., 171° 
W.) is nearly circular, low, sandy, not more than two miles 
in diameter, and very steep outside (Tromelin, Annal. Marit. 
1829, p. 297) : it may be inferred that this island originally 
contained a lagoon, but I have not coloured it .—New Nan- 
tucket (0° 15' N., 174° W.) : from the French chart it must 
be a low island ; I can find nothing more about it, or about 
Mary Island ; both uncoloured. — Gardner Island (5° S., 
174° W.), from its position, is certainly the same as Kemin 
Island, and is described (Krusenstern, p. 485, Appen. to 
Mem. published 1827) as having a lagoon in its centre ; 
coloured blue. 
Islands south of the Sandwich Archipelago. 
Christmas Island (2° N., 157° W T .) : Captain Cook, in his 
Third Voyage (vol. ii. chap, x.), has given a detailed account 
of this atoll. The breadth of the islets on the reef is un- 
usually great, and the sea near it does not deepen so sud- 
denly as is generally the case. It has more lately been 
visited by Mr. F. D. Bennett (Geograpli. Journ. vol. vii. 
p. 226) ; and he assures me that it is low and of coral 
formation : I particularly mention this, because it is en- 
graved with a capital letter, signifying a high island, in 
D’Urville and Lottin’s chart. Mr. Couthouy, also, has 
