160 CORAL LIMESTONES FROM THE SOUTH SEA ISLANDS. 
mass ; these make the rock look very much like a bone breccia 
from a cave deposit. Differe vi portions vary in composition. 
Contains traces of organic matte 
Site 
i 
Hygroscopic moisture ... avert Oe 
Silica = ee 
soluble oe ab ue Ee 
Alumina and 28] 1°69 
Iron nentfishicids \ fa aH oe { 62 
Lime... ae hi 48°75 — 
Magnesia. 3°36 2°33 
Potash . 15 — 
Soda sad “40 — 
Chlorine ... see we traces ,.. ‘12 
Phosphoric acid ... ae ... traces... traces 
Carbonic acid ... OO ee oc 41°25 
100-53 
The cons in the second column were made upon 
another specim 
The red clad ‘of this specimen is pages due to the presence 
of decomposition products, such as clay, &c., derived from the 
disintegration of lava or other aitae rocks ; this seems to be 
borne out also by the presence of alkalies other than as chlorides, 
as well as by the presence of the silica, alumina, ion, and 
magnesia. 
3. Cora Liwestonz, Duke of York Island. 
This specimen and the following was co 
R.N., of H.M.S. “ Pearl,” from a raised pees on the Duke ls ~ 
sea eve 
“ae > 919 
Hygroscopice moisture 
Organic matter : ee Be Nee... 
Silica er 
Alumina and traces of iron sesquioxide 1-973 
Manganese ... traces 
Lime ape. give Ube a . _ 52-094 wot 
ae : Wee pie 
otash é 
Soda... ; 348 
orin B 
Chl ” pie a oe 
Carbonic acid ie aoe 
