408 PACT EMC VOI AUN: 
Sanpwicu Istanps.— Oahu affords decided proof of an elevation of 
twenty-five or thirty feet (p. 251). There isan impression at Honolulu, 
derived from a supposed increasing height in the reef off the harbour, 
that the island is slowly rising. Upon this point I can offer nothing 
decisive. ‘The present height of the reef is not sufficiently above the 
level to which it might be raised by the tides, to render it certain, 
from this kind of evidence, that the suspected elevation is in progress. 
Kauai presents us with no evidence that the island, at the present 
time, is at a 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 sub- 
sidence since, as it now forms a cliff on the shore that is gradually 
wearing away. 
Molokai, according to information from the Rev. Mr. Andrews, has 
coral upon its declivities three hundred feet above the sea. The same 
gentleman informed us that on the western peninsula of Mawz, coral 
occurs in some places eight hundred feet above the sea; and other 
specimens were obtained at a height of five hundred feet. These 
islands were not visited by the writer. 
With regard to Molokai, Mr. Andrews writes to the author that the 
coral occurs “‘ upon the acclivity of the eastern or highest part of the 
island, over a surface of more than twenty or thirty acres, and ex- 
tends almost to the sea. We had no means of accurately measuring 
the height; but the specimens were obtained at least three hundred 
feet above the level of the sea, and probably four hundred. The 
specimens have distinctly the structure of coral. ‘The distance from 
the sea was two to three miles.” 
Mr. Andrews, who appears to doubt the connexion of the supposed 
coral on Maui with reefs, states in a letter to the author: “In no 
case have I seen the coral in arocky ledge ; it is generally mixed with 
the lava rock, to which it adheres. It has usually the appearance of 
burnt lime; and thus, large stones and rocks seem as though they 
had been whitewasnued several times over, and sometimes it amounts 
to an inch in thickness, or an inch and a half. At other times the 
whitewash has found its way into cracks in the stones. Sometimes 
only one side of a stone is whitened by it, or only a corner of it. It 
is sometimes soft and crumbly, and at other times quite hard; and 
again it is mixed with the earth.” Irom this description it appears 
to resemble the lime incrustations and seams of Diamond Hill, Punch- 
