576 Dr. Schafhaeutl on the Different Species of 



Further, I dissolved 20 grains of the present specimen of 

 cast iron in aqua-regia; it was quickly and violently attacked, 

 leaving a black coaly residuum. Nevertheless I'll grains 

 of the iron remained undissolved, which I carefully washed 

 and separated. The solution was then evaporated to dryness, 

 mixed with live times its weight of soda, and exposed to a 

 white heat in a charcoal fire. The mass was found afterwards 

 to be of a yellowish-brown colour, intermixed with black lumps, 

 and several white drops adhered to the lid. Acidulated water 

 was poured over it, and the whole digested for some time. 

 A light gray muddy liquid was the result ; but the mass on 

 the bottom was not much attacked. After changing the acid, 

 its action was very soon stopped again. By adding more 

 acid the action began again vei'y violently ; the whole mass 

 in the crucible was converted into a black viscid mass, filling 

 up the whole crucible, while disengaging carbonic acid with 

 a particularly sharp hissing noise. I poured the whole into 

 a china dish. In the green liquid I found swimming a black 

 flocculent mass in considerable quantity. After some time hy- 

 drogen gas was developed, and the black mass began to di- 

 minish gradually in bulk till all traces of it were lost, and the 

 colour of the liquid, green before, became changed into yel- 

 low. 



The evolution of hydrogen proved that the black mass must 

 have been a reduced metallic body, either silicon or iron. It 

 is very curious that the alkali shewed such a reducing power, 

 which seems to be derived from the carbonaceous matter 

 combined with the oxide of iron ; a case which never occur- 

 red to me at any other time. 



The silica separated weighed = 0*5148 



The oxide of iron „ S-QO-il 



9-4189 

 The chemical constituents of these examples, determined in 

 the usual manner, are shown in the following table, to which 

 I have added the preceding analysis for comparison : 



Gray 

 Ingredients. French 

 Iron. 



Silicon ... 

 Aluminum 

 Carbon ... 



Azote 



Sulphur... 

 Arsenic ... 

 Antimony . 

 Chrome ... 



4-86430 

 1-00738 

 3-38000 

 0-00000 

 0-17740 

 0-00000 

 0-00000 

 0-00000 



W'hite 

 Welsh 

 Iron. 



•00807 

 •08571 

 •30000 

 76371 

 32018 : 

 00000 j 

 59710 1 

 00000 



Creuzot 

 Iron. 



Iron (o). 



Iron (i). 



Iron (c). 



1-0090 



1-860 



2-006 



0-4828 



0-0606 



0-108 



0-098 



0-0134 



1-9100 



5-800 



4-750 



2-7500 



0-7205 



0-874 



0-565 



1-0360 



1-1050 



0-645 



0-800 



0-3800 



0-0000 



4-050 



2-560 



4-0800 



0-0000 



0-000 



0-000 



0-000 



1-38200 



0-000 



0-000 



0-000 



Speci- 

 men {d). 



2-9784 



0-0876 



4-209 



0-6386 



0-433 



3-840 



0-000 



0-000 



0-5204 



0-000 



1-42800 



0-18310 



1-00200 



0-93400 



0-12100 



0-00000 



