J.D. Dana on Changes of Level in the Pacific Ocean. 171 
far this rise affected other parts of the group, I have been unable 
definitely to determine: but as the extensive barrier reefs in the 
eastern part of the group, rarely support a green islet, they rather 
indicate a subsidence in those parts than an elevation. 
i. Islands north of the Feejees.—Horne Island, Wallis, Ellice, 
Depeyster, and four islands on the track towards the Kingsmills, 
Were passed by the Peacock; but from the vessel, no evidences 
of elevation could be distinguished. ‘The first two are high 
islands, with barriers, and the others are low coral. Jotuma, 
(177° 15’ E., and 12° 30’ N.,) is another high island, to the west 
of Wallis’s. It has encircling reefs, but we kuow nothing as to 
its changes of level. 
k. Sandwich Islands.—Oahu affords decided proof of an ele- 
vation of twenty-five or thirty feet. There is an impression at 
Honolulu, derived from a supposed increasing height in the reef 
off the harbor, that the island is slowly rising. Upon this point 
the suspected elevation is in progress. 
Kauai presents us with no evidence that the island, at the pres- 
ent time, is ata higher level than when the coral reefs begun: 
or at the most, no elevation is indicated beyond a foot or two, 
The drift sand rock of Koloa appears to be a proof of elevation, 
from its resemblance to those of Northern Oahu: but if so, there 
Must have been a subsidence since, as it now forms a cliff on the 
shore that is gradually wearing away. 
olokai, according to information from the Rev. Mr. Andrews, 
has coral upon its declivities three hundred feet above the sea. 
The sam gentleman informed us that on the western peninsula 
of Maui, coral occurs in some places eight hundred feet above 
the Sea; and specimens of well defined coral were obtained at a 
height of five hundred feet. These islands were not visited by 
€ Writer, 
With regard to Molokai, Mr. Andrews informed the author 
that the coral occurs “ upon the acelivity of the eastern or highest 
Part of the island, over a surface of more than twenty or thirty 
acres, and-extends almost to the sed. We had no means of 
acchirately measuring the height; but the specimens were ob- 
fained at least three hundred feet above the level of the sea, 
and probably four hundred. ‘The specimens have distinctly the 
Keg of coral. The distance from the sea was two to three 
? 
Mr Andrew ‘ ti f the su 
; s, who appears to doubt the connection o up 
Posed coral on Maui with reefs, writes to the author as follows : 
‘Inno Case have I seen the coral in a rocky ledge; it is gen- 
Stall Mixed with the lava rock, to which it adheres. It has 
