On ibe Compofition and Properties, &c. 13 
* . There was a refidue of 30 grains, almoft pure carbon s 
and rograins of heavy black and brown matter, a little above 
the coated part of the tube. In this laft-mentioned matter 
weré many fmall.white /picu/a. At about half an inch above 
the carbonaceous refidue, dark gray matter had been raifed, 
which weighed 15 grains. 
This fublimed gray matter did not contain any ammo- 
niac, nor throw down any pruffiate of iron, with fulphate of 
iron, It reddened turnfole paper and tinGture. It diffolved 
in cauftic foda; from which folution muriatic acid precipi- 
tated nothing ; for, although on dropping it into the folution, 
milkinefs sepesiicl the squid foon grew clear again. 
Ten grains of this fubiimate diffolved in four ounces of 
boiling water; which being evaporated to half an ounce, 
there was, on cooling, a copious depofit of white /picula*. 
The fublimate had a fharp, but not four tafte. Being boiled 
in muriatic acid, and alfo in nitric, it did not diffolve at all; 
but remained, on evaporation to drynefs, in the fame ftate as 
before; and it muft be particularly obferved, that it left no 
red or pink matter, on evaporating the nitric acid from it. 
Sulphuric acid did not a&t upon it in the cold; but, when 
heated, it diffolved it, without effervefcence, from which fo- 
lution nothing was precipitated by cauftic foda: on evapo- 
rating it to drynefs, black fumes arofe, leaving behind only 
a black fiain. This fublimed matter did not render lime 
water turbid. Boiled in muriatic acid, fo as to carry off - 
all but a very little free acid, on the addition of lime water 
there was no turbid appearance, but milkinefs enfued on 
adding oxalic acid. 
* The fpicula, in the 10 grains of fublimate above men- 
tioned, feemed to be of the fame nature as the matter juft 
deferibed. 
The whole of this fublimate amounted, by eftimation, 
to 18 grains; and I apprehend it is the acid fublimate of. 
Scheele, 
* From the depofition of thefe /picula by cooling, and from many of the 
i {lowing properties, they appear to be analogous to benzoic acid, 
K4 The 
