196 APPENDIX. 



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 Isld. (8° S., 17 2° W.) is described 

 by Commodore Byron (chap. x. of his Voyage) as an atoll ; 

 blue. — Sydney Isld. (4 S., 172 W.) is about three miles in 

 diameter, with its interior occupied by a lagoon (Capt. 

 Tromelin, Annal. Marit, 1829, p. 297); blue. — Phoznix 

 Isld. (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 in- 

 ferred that this isld. originally contained a lagoon, but I 

 have not coloured it. — New Nantucket (o° 15' N., 174 W.). 

 From the French chart it must be a low isld. ; I can find 

 nothing more about it or about Mary Isld. ; both un- 

 coloured. — Gardtier Isld. (5 S., 174 W.) from its position 

 is certainly the same as Kemin Isld. described (Krusenstern, 

 p. 435, Appen. to Mem., publ. 1827) as having a lagoon in 

 its centre ; blue. 



Islands south of the Sandwich Archipelago. 



Christmas Isld. (2° N., 157 W.). 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 unusually great, and the sea near it does not deepen so 

 suddenly as is generally the case. It has more lately been 

 visited by Mr. F. D. Bennett (Geograph. 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 isld., in 

 D'Urville and Lottin's chart. Mr. Couthouy, also, has 

 given some account of it {Remarks, p. 46) from the 



