Notice of a: Silicious Petrifaction: og 
very free from quartz, but I found nearly the same propor- 
tion of siler as before, so that silex seems to enter into the 
the quantity of water, and this will leave the carbonic acid 
very nearly in the proportion required from ‘the composi+ 
tion of carbonate of lime. This mineral has been found in 
abundance in Williamsburgh. It occurs in considerable 
ae ofa beautiful pearly lustre, and laminated like ‘the 
other. ~~ . ‘ 
Arr. V.—Notice of a Silicious Petrifaction, from \N. 
agi ¥ ei i5Qarelind? fom fgand'ly 2iyeent 
- ta ee “Gt, wee hh swe seer 
'. [Extract of a letter from Mr. Toomas Sraope.} + ao }ret: 
aye wit 2: BF 
Fayerrevitue, No. Caro. 3d July, 1823. . 
1 sewp you some specimens of petrifactions; they are 
common through the union, but this appears to be froma 
Pine tree, the first Lever saw, and what is remarkable, it is 
on a high dry sand hill, elevated about neers 
the level of the river, in a situation that would seem.almost 
to preclude much moisture. Mr. Eccles, an intelligent and 
respectable gentleman in the ueighbourhood, recollects it 
thirty years past, when it was nearly the entire tree 5 the 
change of wood into stone is certainly a chemical process, 
Petrifaction.* I will remark that the stone in this vicinity 
is sand united by the oxide of iron, of which I send you a 
Specimen. | arm of opinion from some, th 
experiments, that by pulverising this stone, 
* : : eee ‘ally mixed with sand, (a ve- 
We believa this to bes mistake ' 5 Se anal in a state of ane 
and mixing it 
‘heat of the sand. (J. G. P.) 
Vor. VIl.—No. 2, 32 
