On the Composition of Swedish Stone Paper . 438 
solution of arsenical liver of sulphur was prepared in the 
following manner : One part of the arsenical liver of sul- 
phur was mixed with two parts of clear quicklime, in a 
porcelain vessel, over which was poured six or eight parts 
of boiling water. The solution was then poured off, and 
the wood which had been impregnated with the above 
metallic solutions being placed in it and suffered to re- 
main several days, the vessel being closely shut, it as- 
sumed a black colour. The solution of acetite of lead 
produced the greatest effect ; that of silver next, and those 
of the other metals least of all. Spotted wood, and par- 
ticularly that of the plane, beech, and pear tree, assumed 
the best colour. It is therefore beyond all doubt that po- 
rous wood, such as that of the lime, the elder, &e. could 
be stained much easier. Though the arsenical liver of 
sulphur from lime may appear superfluous, as the com- 
mon, which is prepared from alkaline salts and sulphur, 
can produce the same effect, the above process however 
is that which ought to be recommended. This method 
of staining may be considered as the best, because it im- 
pregnates the wood with metallic particles, gives it a hard- 
ness susceptible of a fine polish, and secures it from worms. 
The vessel employed for this purpose must be either of 
porcelain, stone ware, or glass. 
No. £6. 
Experiments made to ascertain the Composition of the 
Swedish Stone Paper or Artificial Slate . By J. G, 
Georgi.* 
THE invention of Arfuid Faxe, confirmed by many 
experiments tried at Carls crona, but not yet communica- 
* Tilloch, vol.3, p. 158. From the New Transactions of the Imperial Academy 
at Petersburghy vol. 4. 
