193 
Chemistrij. 
O 
Ditto. 
18.5 Water of Bitumen. 
1.33 Bituminous Water. 
0.1 Fetid Bituminous-Water. 
0.1+ Water. 
Traces of. 
0.2- Bituminous Water. 
,3.1 Ditto. 
Considerable ditto. 
Ammonia was found in many cases, but Mr Knox considers it 
as a 'product and not an educt^ arising from the decomposition 
of the bitumen, either by the iron of the retort, or the carbon of 
the stove at a high temperature. In these distillations a matter 
often condensed in the retort, which v/as exceedingly volatile^ 
and which was easily raised in vapour by the heat of the hand. Mr 
Knox concludes by recommending to chemists a previous distil- 
lation in all analyses of stony substances, in order to obtain the 
liquid bitumen, and also the carbon which has escaped in the 
shape of gas ; and also that the residuum in the retort should be 
afterwards examined for the remaining carbon, either by burning 
it off, or in such other manner as may seem best to the operator. 
—See Phil. Trans. 1823, p. 517-528. 
24. Composition qf James^ s Powder. — Mr Phillips hais found 
James’s powder from Messrs Newberry, to consist of 
Peroxide of Antimony, - - 56.0 
Phosphate of Lime, - - 42.2 
Oxide of Antimony, impurity and loss, - 1.8 
100.0 
Ann. of Phil. v. i. 1819. N. S. 
25. Gold crystallised from its solidion in Sulphuric Ether.^ 
Having allowed a solution of gold in sulphuric ether to stand 
four years in a vessel, with a cork and a piece of leather tied 
over it, Mr Sivright found that a great part of the liquid had 
evaporated, leaving the gold in the form of a thin plate, which 
has the usual brightness of pure gold, and resembles the flat pieces 
of native copper found in Cornwall. There were distinct crys- 
tals in one or two parts of the plate. 
26. On the Fusion of Plumbago a7id Charcoal.— A.^ the ex- 
periments of Professor Silliman, which we have given in our 
VOL. x. NO. 19. TAN. 1824. N 
Menilite, 
Adhesive-slate, 
Mica, 
Pearl-^yhlte ) 
common Quartz, f 
Carrara Marble, 
Lucullite, 
Obsidian, 
Amygdaloid, 
Bole, 
