121 
called Sydneia or Terra Australis. 
but, to obviate as much as possible any doubt or objection, I 
determined to repeat the experiments, and the analysis, on that 
portion which remained of the identical substance examined by 
Mr. Wedgwood, and which from that period had been reserved 
by Sir Joseph Banks, who kindly favoured me with it for this 
purpose. 
§• 3 - 
Analysis of the Sydneia, No. 2. 
This substance, as has already been mentioned, consists of 
a white transparent quartzose sand, a soft opaque white earth, 
some particles of white mica, and a quantity of dark lead-grey 
particles, which have a metallic lustre. 
The Sydneia, No. 2, appears chiefly to differ from No. 1, by 
being more arenaceous, and by a larger proportion of the dark 
grey particles. Many experiments, similar to those made on 
No. 1, already described, were made on this substance, with 
pure concentrated muriatic acid ; but, as none of these afforded 
any appearance of a precipitate by the means of water, I do not 
think it necessary to enter into a circumstantial account of them, 
and shall proceed therefore to the analysis. 
A. 100 grains were exposed to a red heat, in a glass retort, 
and, after half an hour, were found to have lost in weight 2.20 
grains. 
B. The 97.80 grains which remained were mixed with 300 
grains of dry carbonate of potash, and the mixture was exposed 
to a strong red heat, in a crucible of silver, during three hours. 
When cold, the mass was softened with water, and was put 
into a glass matrass. I then added three ounces of pure con- 
MDC-cxcviri. R 
