THE COLOURING MATTER OF ERIOCOCCUS EUCALYPTI. 275 
23° C was 1:03. Upon organic analysis, 100 parts of purified 
wax gave C 78°22, H 11:01, and O 10°77, therefore the com- 
position of the compound was supposed to be C,,H,,0. 
A’ comparison was made between this wax and that of the scale 
Ceroplastes ceriferus :— 
The details in connection with the wax of Ceroplastes ceriferus were taken 
from Jndian Museum Notes, Vol. II, No. 3, on ‘‘ White Insect Wax in 
India.”—K. C. Cortes. 
Ceroplastes ceriferus. Ceroplastes rubens. 
Melting point oe \ ue S ee 2 
At 15° C. At 23. 
Specific gravity he 1-04 1-05 
Supposed aaa 
of wax, calculated 
from percentage ( ee Bel 
composition 
The wax has no value as a varnish, and it burns with a smoky 
flame and resinous smell. 
The supposed formula C,,H,,O, must be considered as tentative 
only, until further combustions have been made upon larger 
quantities of purified wax. 
No. 4. METALLURGICAL METHODS IN USE AT 
BROKEN HILL. 
By G. H. Buakemore. 
(Read Saturday, January 8, 1898.) 
I HAVE ventured to think that a short history of the methods of 
ore treatment in vogue at Broken Hill of this Colony, may be of 
some small interest to members, more particularly to those 
interested in the mining and metallurgy of silver ores. 
To most mining people there is a never ending interest in the 
methods of ore treatment followed in the various parts of the 
world ; in the complications arising and the difficulties experienced 
in the several operations leading to the successful financial end 
that shareholders naturally expect. Too little is known or written 
on the vast subject of metallurgy, no matter of what metal (if we 
except steel and iron), and a wider spread general information 
would have saved the untold sums of money which ignorance has 
wasted. Too iittle credit is given by practical mining men to the 
