18 
ALUMINITTM AND THE CLEVELAND KAOLIN. 
it seems more nearly to resemble a pottery than it does a china 
clay. 
Pottery clay, as is well known, varies exceedingly in com- 
position both in the amount of silicate of alumina and in that of 
free silica and other impurities which it contains. Analysis 
showing samples to yield from 44 to 58 per cent of silica, 23 to 
24 per cent of alumina, 1 to 7 per cent of oxide of iron, and 10 
to 15 per cent of water. 
[Note , — As a result of the false importance assigned to these^ 
clay beds, applications had even been made to the authorities 
for prospecting areas ; the community is therefore indebted to 
the author for dispelling the illusions which had arisen regarding! 
them. — E d.] 
SILVER AND ITS OCCURRENCE IN NATURE AS ILLUS- 
TRATED BY THE RIVERTREE ORES. 
BY 
Edgar Hall, F.C.S. 
(Read on 4th August, 1892 : vide “ Queenslander,'^ 20th August, 1892). 
