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. Jt increased after the first ignition = 0"064 

 „ second ,, = 0*209 



„ third 5, = 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 with 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 



