520 Dr. Schafhaeutl on the Different 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 , . , = O’OOOO 
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 0*4500 
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*8460 
After the fourth ignition, (and it had now become 
light red) 0*8108 
After the fifth ignition 0*2100 
,5 sixth 0*1624 
„ seventh 0*1440 
5 , eighth 0*0180 
„ ninth 00540 
„ tenth „ 0*0000 
2*6949 
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 and manganese . . . 9 3703 
Phosphorus 0*9450 
Silicon 0*3532 
Aluminum ...... 0*0212 
Azote 0*2521 
Carbon 0*6685 
Loss 0*0358 
12*0050 
The hydrochloric acid in the retort had dissolved 
Iron ....... 
Chromium 
Phosphorus . . . . 
The SLilphuret of lead yielded 
Sulphur 
. 0*3867 
35*0000 
