[ 3° 6 3 
X'VII. On the Analyfis of a Mineral Subfance from New South 
Wales. In a Letter from Joiiah Wedgwood, Efq. F. R. S. 
and A. S, to Sir jofeph Banks, Bart. P. R. S. 
Read April 15, 1790. 
DEAR SIR, Etruria, March 12, 1790,- 
1 HAVE the pleafure of acquainting you, that the clay 
from Sydney-Cove, which you did me the honour of lub- 
netting to my examination, is an excellent material for pot- 
tery, and may certainly be made the balls of a valuable manu- 
fafture for our infant colony there. Of the fpecies of ware 
which may be produced from it, you will have fome idea from 
the medallions I have fent for your infpe&ion. 
The other mineral, which you favoured me with a fpecimen 
of, feems to me to contain one fubftance hitherto unknown, 
and another not known in the Rate of purity in which it is 
here found. I (hall therefore take the liberty of ftating, as 
concifely as I can, the principal refults of the experiments that 
have been made upon it by myfelf and my affiftant Mr. 
Chisolm ; Submitting it to your judgement, whether any of 
them be of Importance enough to be laid before the Royal 
Society. 
I have the honour to be, &c. 
JOS. WEDGWOOD. 
Analytical 
