APPENDIX. 371 
to be Waterlandt, is one of the two islands ; and that Captain Hage- 
muster has not seen the other. In order to refute Captain Duperrey's 
hypothesis, the second island, which, according to him, Captain 
Hagemuster might not have perceived, ought to be searched for, to 
the westward of Captain Hagemuster's island ; if it really does exist, 
it cannot be at a greater distance than about fifteen or twenty miles. 
*XII. Commodore Byron's Isles of Disappointment have not been 
visited since their first discovery in 1765. I have endeavoured to 
settle their longitude at 140° 42' W. (page 87 of my supplement;) 
but this being only an approximation, they ought to be surveyed — at 
least visited anew. 
*XIII. By my Memoirs, page 281, and supplement, page 90, you 
will perceive that there is a difference of 27' between Captain Bel- 
linghausen'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 desirable to settle this point, by examining and sur- 
veying 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 
Clermont 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 Minerva. 
Captain Duperrey, on the contrary, maintains that the island Minerva 
* On some charts this island is named Dean's Isle ; on my charts, Vlighen Isle. 
t By Captain Porter called Gamble ; by Captain Kotzebue, Krusuntze Island. 
