520 Dr. Schafhaeutl on the Differejit Species of 



in the usual way with hydrochloric acid, left a residuum 

 = 12*005. When heated carefully in a platinum crucible, it 

 began to glow, and being quickly removed from the fire, after 

 cooling it became black, and had gained . . , =i 00000 

 After the second ignition it was observed to glow 

 from within, and after cooling was found to be red 

 within, covered with a black crust. It had gained O'^SOO 

 After the third heating, a speck like a pin's head 

 only began to glow, and the whole mass only be- 

 came ignited after the sides of the crucible were 



red hot, and had gained 0"84;60 



After the fourth ignition, (and it had now become 



light red) OSIOS 



After the fifth ignition 02100 



„ sixth „ 0-1624? 



„ seventh „ 0-1 't^O 



„ eighth „ 0-0180 



,, ninth „ 0540 



„ tenth „ 0-0000 



2^9i9 

 After being boiled with hydrochloric acid, the usual light 

 gray powder remained = 1-603. When ignited, it lost 0-3500, 

 and a reddish-white powder was left amounting to 1*253 

 grains. The hydrochloric acid extracted from it peroxide of 

 iron, contaminated with a little chromium = 0*5176, and left 

 silica = 0*7353. The hydrochloric acid held in solution 

 oxide of iron and chromium, and the whole remainder con- 

 sisted therefore of 



Iron combined with silica . 0-3589 

 Iron antl manganese . . . 9 3703 

 Phosphorus ..... 0-94.50 



Silicon 03532 



Aluminum 0*02] 2 



Azote 0-2521 



Carbon 06685 



Loss 0^58 



12^050 

 The hydrochloric acid in the retort had dissolved 



Iron . .' 21-954-9 



Chromium 0-4837 



Phosphorus 0-1697 



The sulphuret of lead yielded 



Sulphur 0-386 7 



3"5^0000 



