430 Dr. Schafhaeutl on the Different Species of 



the gelatinous silica, and analysed like graphite, as stated in 

 the beginning of this treatise, proved to be of the same com- 

 position as the graphite B. 



I must here observe, that in fragments broken from the 

 outside of the same pig~nietal traces only of sulphur could be 

 discovered ; that the malleable iron produced from this ac- 

 cording to my puddling process was extremely soft, and had 

 the peculiar property of welding so easily, that tin-plates rolled 

 from it adhered so firmly together by heating them a little 

 too much, that it became impossible to separate them ; but 

 the great quantity of silicon contained in this iron was ex- 

 tremely destructive to the bottom and sides of the 'puddling 

 furnace. 



Let us now return to the residuum of iron (B.); white 

 Welsh iron. This residuum was found to weigh 6*77 grains, 

 and had a dark brown colour and a very strong unpleasant 

 smell, peculiar to hydrogen obtained in this manner from cast 

 iron. It was powerfully attracted by the magnet, and traces 

 only of aluminum could be found. 



3*13 grains of the dried residuum, heated cautiously in a 

 weighed platinum crucible, began to glowaroundthe periphery 

 before the crucible became red-hot, and the ignition spread 

 from thence very slowly towards the centre. The platinum 

 crucible was now removed from the fire, covered with its lid 

 and cooled near concentrated sulphuric acid under a bell 

 glass. Its weight had increased 008 grains, and its colour 

 changed from brown to black. On the crucible being again 

 placed over the lamp and kept in a red heat for ten minutes, 

 its black colour changed into a dirty light red, and its weight 



increased equal to 0*27 



On a third repetition of this ignition .... 0*02 



On a fourth 0-05 



On a fifth O'OO 



0-42 

 The whole increase of 6*77 grains would therefore be 

 0-9084. 



It was still as powerfully affected by the magnet as pre- 

 viously to ignition. A part of this powder, 3*55 grains, heated 

 with hydrochloric acid of 1'16 sp. gr,, in the same crucible, 

 a grayish powder remained, which presented a distinct in- 

 terspersion of dull black with white spots, and weighed 0"290; 

 after ignition it had gained 0*028 and became perfectly 

 white. 



It consisted entirely of silica, for which we reckon 0'1528 

 silicon. As the black spots disappeared and it gained 0*028 



