Cast Iron^ Steel, a?id Malleable Iron. 517 



of iron, gave by combustion in Liebig's and Diimas's appa- 

 ratus, 



Carbon .... 1 "22^00 

 Hydrogen . . . 0-03684 



Azote 0-264 



Tlie residuum of the same iron, treated with hydochloric 

 acid, sp. gr. 1*1 4, left 



Carbon . . . 0-3862 

 Hydrogen , . 00297 

 Azote .... 0-2833 

 The actual quantity of azote and the other contituent cal- 

 culated by direct chemical analysis, is shown in the follow- 

 ing table : — 



For 35 grains in per cent. 

 Silicon . . . 0-353 = 1-00867 



Aluminum 

 Antimony 

 Phosphorus 

 Sulphur . 

 Azote . , 

 Carbon . 

 Iron . . 

 Loss . 



0-030 = 0-08571 

 0-559 = 1-59710 

 0-030 = 0-08553 

 0-112 = 0-32018 

 0-268 = 0-76371 

 1-505 = 4 30000 

 32-033 = 91-52282 

 00-110 = 00-31428 



35-000 = 100-00000 

 Iron of the works of Creuzot, departemerit de Saone et de 

 Loire. Specific gravity = 7-536; the colour of the fracture 

 dead grey. Treated as usual with hydrochloric acid of spe- 

 cific gravity 1-103, The evolution of hydrogen gas con- 

 tinued for fourteen days. The escaping hydrogen had an in- 

 tolerable smell, somewhat resembling the smell of selenium. 

 The remainder in the retort had retained the shape of the 

 tragments of the iron previous to solution. When washed 

 upon a filter, as soon as boiling water was poured upon the 

 partially dry fragments, the air contained between the pores 

 of the fragments escaped with the same hissing noise lor a 

 considerable time, as hydrogen escapes when hydrochloric 

 acid is poured upon iron. In 35 grains of this iron 032 13 

 grains of sulphur were contained, and the remainder was 

 = 14-880 of a yellowish-brown colour. Concentrated hy- 

 drochloric acid when cold had no further action upon it; 

 when boiled with the same acid for ten minutes it had lost 

 4-586 grains of iron. The remainder = 10-294, heated in a 

 platinum crucible, did not glow or take fire spontaneously % 

 but brought to a red heat, it at once attained a lively white 

 appearance of ignition, which immediately subsided into its 



