224 PROCEEDINGS, 
I madea careful examination of the pe sections of this rock, which were 
t mi 
vn 
Im te that in my iat experience I hay -_ with — of eo 
ee geological character e large islands nich s St. Chri and 
o be form 
phic rocks— fanked 1 by the 
coast by elevated Socal: limestone edits toa hel igi in some instances of 
several be ed feet above the sea. In Florida I raced the coral oe 
eet e the sea, offers interesting confirmation to Mr. 
—T ~ coral islands. 
In o1 ce I succeeded in finding, in situ beneath the crust of coral- 
rock, the crystal ine eruptive rock of the original island before it underwent 
subsidenc and beca. thed with coral. 
nr island of Usp ne esen al yet aaollien eget of eological structure : & 
inferox s limestone woo 
em in si itu. ntend however to continue my observat sons on this island. 
Professor edie remarked that some years ago Mr. Brown, 
the Wesleyan missionary, brought from New Piritain a soft white 
limestone which was quite undistinguishable from chalk, not only 
parma but chemically, and pointed out that this discovery of 
flints afforded another very strong proof of the probable ] presence 
of true chalk of Cretaceous age in : the South Sea Islands.* 
cee of Water from the Islands of Simbo and Sees Ann, 
i a Guppy, Surgeon, H.M.S. “ Lark. 
Wailava is about half a mile across in len : gees has @ Ph 
- 15 fathoms as ascertained by Lieut. Oldham. On carefully 
xamining this lake, I found that its waters are about the sea- 
level, Sones they are not affected by the rise and 3 “di is tides. 
one side it is only separated from the sea by a low 
about one-third of as across and not slewsted more Toe twenty 
feet above the sea. The surface of this tract is strewn with coral 
en rT 9 
‘tention of the Royal Society of N.S. W. for 1877, Vol. XL 
