159 
On the Composition of some Coral Limestones, &c., 
from the South Sea Islands. 
By A. Liversipasr, Associate R. 8. Mines, Beck . ee 
and Mineralo ogy in the University of Sydn 
[Read before the Royal Society of of N.S. W., 6 October, 1880.] 
1. Reer Cora, New Hebrides. 
A WHITE crystalline limestone, the fractured surfaces of which 
present all the on of ara onite ; for the most Lee it 
with a thin film of purple-coloured organ anic matter, which burns 
when heated on platinum foil. Before the blowpipe the limestone 
oe ae and falls to pieces like aragonite. 
am indebted to the kindness of the late raggye 
Goatees R.N., for this and the succeeding specimen. This 
tinguished naval officer always took a very lively Se in the 
antes and mineralogy of the countries which he visited, and 
seldom failed to collect and bring back with him re specimens 
which were procurable. 
Lasihite: Island of Vati, or Sandwich Island, New Hebrides 
Group ; from shore at the level of high-water-mar 
Fp a 
Hygroscopic moistur i 26 
Alumina and traces of i iron  sesquioxide 23 
Lime 54°62 
Magnesia 08 
Silica en ee ‘51 
”» soluble oe aie Ses wk 21 
‘Potash ‘ = ie cate ... traces 
um chloride sie Sing 1:02 
Phosphoric acid... ce ue ... traces 
Carbonic acid . <x 4232 
a 75 
100-00 
A second portion from the. interior only contained traces of 
sodiumichloride =... 
2. Rep. REEF Corat,,. New Hebrides. 
Bad a reddish brown colour, intermixed with white, due mostly 
small fragments of coral and shell disseminated through the 
