APPENDIX. 357 



XIII.* By my Memoirs, page 281, and supplement, page 90, you will 

 perceive that there is a difference of 27' between Captain Belling- 

 hausen's and Captain Kotzebue's longitude of the west point of Prince 

 of Wales's Island* and the island situated to the westward of it.f 

 What may be the cause of this difference ? since the two navigators 

 do not differ, either before or after, more than three minutes. Either 

 the length of Vlighen Island has been overrated by Captain Kotzebue, 

 or some other error has crept into the longitude of either the one or 

 the other. As both are excellent observers, it would be very desi- 

 rable to settle this point, by examining and surveying carefully all 

 the islands lying to the westward and eastward of Vlighen Island, 

 and determine with*the greatest precision the width of the channels 

 separating the different islands, as well as the exact length of Vlighen 

 or Prince of Wales's Island : the error will, most likely, be detected 

 in the length of that isle. 



XIV.* There is a difference of 17' in the longitude of the isle Cler- 

 mont de Tonnerre between Captain Duperrey and Captain Beechey. 

 At Serle Island, close to it, there is hardly any difference at all. The 

 same difference of 17' exists in the longitude of Prince William Henry, 

 which Captain Beechey has proved to be the same with Captain 

 Duperrey's isle Lortingo ; whereas at Mollu Island, both Captains 

 Beechey and Duperrey agree perfectly well. It would be worth while 

 to search for the cause of such anomalies. 



XV.* Captain Beechey is of opinion that Captain Duperrey's isle 

 Clermont de Tonnerre is one and the same with the island of Minerva. 

 Captain Duperrey, on the contrary, maintains that the island Minerva 

 is the same as Serle Island. I am of this latter opinion ; although the 

 solution of this problem will much depend upon the distance of the 

 island Clermont de Tonnerre from Serle Island, which is much less on 

 Duperrey's chart than on Captain Beechey's. 



XVI.* There has been lately discovered an island of considerable 

 extent, of the name of Raraka. It would be well to examine it, since 

 the account given of it is not quite satisfactory. It is stated to be 

 situated in 16° 3' S., and 145° 0' W. 



XVII.* I have placed on my chart of the Low Islands, several 

 islands, the position of which is rather doubtful; for instance, the 

 Bunyefs Group of Turnbull, the island of Britomart, the islands dis- 

 covered by Quiros, and several others. In order to have any certainty 

 about their existence and precise position, it is necessary to search for 

 and make a survey of them. 



* On some charts this island is named Dean's Isle ; on my charts Vlighen Isle 

 t By Captain Porter called Gamble ; by Captain Kotzebue, Krusenstern Island. 



