130 Scientific Intelligence. 
bases, the slag is formed of bisilicates, and evidently approximates very 
nearly i in composition to some varieties of augite (pyroxene) containing 
umina.” 
Crystalline slags, undetermined.—No. 11 was brought by Mr. Black- 
well from the hot-blast furnaces called L’Espérance, at Seraing, near 
Liége, i in Belgium 
his slag is brown, porous, and confusedly crystalline. 
Analysis. Oxygen. 
Silica, - , > : 55°77 - 28°97 
Alumina, ’ : : 19-96: . 6°49 
Lime, ° , : ‘ 22:22 
Magnes : 2:10 
a eeaey of pienge ; 2°52 By SO 
Protoxyd of i ‘ 2°12 
Potassa, ° : . PTS St ‘ 0°30 
100-41 
“ As the crystallization was very confused, and as the analytical re- 
sults do not point satisfactorily toa formula, we do not attempt to 
duce any rational ue of the composition of this slag.” 
n of “ refinery cinder” produced in the Brom- 
ford Iron Works, near ag Eien and was eeercibestied by one of 
tbe proprietors, our friend, Mr. John Dawes. The process of here 
which is not now extensively practised in Staffordshire, consists in ex-. 
posing the surface of melted cast iron to the action of a indi; The 
products are refined or white iron, and “ refinery cinder” or slag. 
iis 
Analysis. Oxygen. 
Silica, *° : : vot wee ek * 1PS2 
Protoxyd of iron, * : 61:28 -: - 13°95 
Protoxyd of manganese, ° 358 ° , 0°70 
Penis Tae : 3°41 
. ‘ ‘ 3:41 2 A 0:97 
iaga : : . O76 - . 0:29 
maclde, : ‘ : : 0-46 
Error of loss, - : ‘ 0-45 
00 
*“ From the identity in crystalline ms of this slag with the one suc- 
ceeding, we are inclined to regard it as a mixture of silicate of protoxyd 
of iron with a considerable amount of impurity, represented especially 
by the alumina. This view would also appear to receive confirmation 
from an inspection of the slag itself. We need sca arcely refer to the 
numerous instances of well-formed crystals containing much foreign 
matter, so that there seems to be nothing improbable in this view re- 
specting the composition of the crystals of this slag, which are certainly 
not perfectly formed.” 
Crystalline slags of Silicate of Iron. a 13 is a pare ag crys 
tallized specimen presented by Mr. Dawes. It was found in the flue 
of a puddiing furnace, where it a probably as exposed Pah yer 
temp erature for a considerable tim 
Ch surface of this slag is ‘ial with bright black crystals, ex- 
hibiftaig =r an iridescent tarnish. The er ; belong to to the 
BE pe i ge Poe arn aes v: 
: era foe ; a 5 
£ = eats ie i 
eam Ht she TS A EE ee i tees Mar AS Sh: Shee ae deel heoeto 6, 0, See. rr eee 
