58 Native Sulphur of Jive: 
As this subject is one of much practical. importance to the 
rising arts of this country, and as much interest has beer 
excited in Paris concerning our porcelain clays, we should feel 
greatly obliged by the transmission to us of any specimens of 
American porcelain clays, with memoranda of the place, the 
quantity, the depth at which obtained, the difficulty of obtain- 
ing, and, generally, all the peculiar circumstances. We wi 
take care that their value shall be ascertained, if they appear 
promising, and a proper return sliall be made to the ‘pro- 
prietors 
To those of our readers who may not be familiar with this 
‘subject, we would however take the liberty to remark, that 
porcelain clays generally arise from the decomposition of gra- 
nite, and particularly of that kind which is denominated graphic 
granite, and which abounds with feldspar. It is, therefore, in 
the primitive countries that we are chiefly to expect them— 
such as New-England, and part of the high country of the mid- 
dle and southern states. 
It should be observed, that if a clay, otherwise apparently 
good, burns red, it contains iron, and is unfit for porcelain; 
although it may serve well enough for more contmon and coarse 
earthenware. 
1 aes r=. * 
Art. VIII. Native Sulphur from Java. 
T'nroven the kindness of Mr. J. Huntington, recently re- _ 
turned from Java, we have received from that Island, some fine 
specimens of nativé sulphur. They are very pure, of an 
orange yellow, slightly shaded with white, and oceasionally 
with red ; some of the cavities are lined with delicate crystals. 
What gives them particular interest is, that they are believ 
to be from that “large, and now nearly extinct, volcano, 
about sixty miles from the town of Batavia, at the bottom of 
which (of the crater) lie large quantities of native sul- 
phur, even many hundred tons.” It is in the crater of this 
volcano that the famous lake of sulphuric acid exists, and from 
which a river of the samé acid flows down the mountain, 
