ON FULIGOKALI AND ANTHROKOK ALL 
285 
Dissolve the sulphur and potash by heat with a little 
water, then mix the fuligokali, and evaporate the whole to 
dryness. 
This is very soluble and has an extremely fetid odor, par- 
taking both of carburetted and sulphuretted hydrogen. 
Jlnthrokokali and its compound with sulphur are prepara- 
tions analogous to the two above mentioned. Dr. Polya di- 
rects 160 grammes of porphyrized stone coal to be mixed 
with 192 grammes of a very concentrated and boiling solu- 
tion of caustic potash in an iron dish over a fire: when well 
mixed it is withdrawn from the fire and stirred with a 
pestle, until converted into a uniform black powder. It is 
then transferred to well stopped bottles to prevent deliques- 
cence. 
To prepare the sulphuretted anthrokokali add to the 160 
grammes of finely levigated coal sixteen grammes of sulphur, 
and proceed as above directed. The combination of anthracite 
with potash is not so complete as in the case of soot. The 
product afforded by Dr. Polya's process deposits from its 
aqueous solution some uncombined carbon, and the same solu- 
tion, filtered and evaporated, furnished a dark colored pow- 
der, consisting principally of carbonate of potash. 
It becomes difficult to give a formula expressing the exact 
constitution of anthrokokali, the chemical nature of coal being 
so little known; but we are aware that it is a fossil resulting 
from the decomposition of lignite, carbonized by galvanic 
action, and differs in constitution according to differences of 
locality, containing more or less argilaceous matter, sulphur, 
&c, but consisting almost wholly of carbon, with but little 
hydrogen and oxygen. Soot consists principally of carbon 
and pyrotine (pyrogenic resin) with acetic acid combined 
with lime, potash, and other substances. 
From what we know of the composition of coal and soot, 
it is to be inferred that the action of an elevated temperature 
upon these substances causes a quantity of carbon to be con- 
verted into carbonic acid, which, uniting with the potash, de- 
stroys its causticity, while other reactions taking place dis- 
