574? Dr. Schafhaeutl on the Different Species of 
The remainder of the solution of this iron in hydrochloric 
acid, heated in the crucible, showed no disposition to glow like 
the specimens before-mentioned; it lay still dark on the bot- 
tom, after the crucible had become for a considerable time red- 
hot, and after four ignitions its appearance was but very slightly 
altered. It increased after the first ignition = 0*064? 
„ second „ = 0*209 
„ third „ = 0*096 
„ fourth „ = 0*016 
0*385 
35 grains of the specimen {a) boiled in aqua-regia for five 
minutes, left a residuum only = 3*7625. It was this solution 
in which the before-mentioned black scales were generated. 
The same quantity of iron treated in a retort with diluted 
nitric acid, left only 2*30 grains of residuum, without the de- 
velopment of any carbonic acid, which shows that during the 
solution a new compound is formed, of which azote and 
hydrogen form a prominent part. 
By treating the same quantity of iron with still more di- 
lute nitric acid, carbonic acid gas was evolved, and the re- 
siduum was found to be 3*144 grains. 
From this residuum, boiled in a platinum dish wdth nitric 
acid, sulphur was very soon separated, which was removed 
after renewing the acid ; and boiling it again till decomposition 
was entirely completed, perfectly white silica was separated, 
which in the course of drying on the filter, became inter- 
spersed with beautiful blue spots, having a resemblance to 
phosphate of iron. 
The 2*3 grains residuum of the iron, treated in the second 
experiment in the retort, was, after the action of the acid had 
ceased, poured out with the acid into a china dish, and re- 
mained untouched for six weeks. 
After the lapse of this time, a brown sediment was as usual 
found on the bottom, and in the middle of it a white mass, 
composed of gelatinous granulations, interspersed with brick- 
red or vermilion points, like vanadic acid. A great part 
of this gelatinous residuum retained the perfect form of the 
fragments of cast iron, the skeleton of which they formed. 
These gelatinous fragments, when divided, showed the in- 
terior to consist of gelatinous layers, which from the second 
layer down to the centre were of a beautiful blue colour. They 
imparted to diluted hydrochloric acid when poured over them 
a green colour, which was destroyed by ammonia, and again 
revived by acids. Reagents as well as the blowpipe discovered 
nothing in the solution except protoxide of iron, carbon and 
