364 REPORT—1846. 
Rammelsberg’s admirable work previously referred to. The silicate of alu- 
mina exists probably as an accidental constituent, and does not enter into 
the formula (Vide ‘ Handbuch der Chemie,’ von L. Gmelin, Zweiter Band, 
p- 383). 
W 
This specimen was brought by Mr. Blackwell from the hot-blast furnaces 
called L’Espérance, at Seraing, near Liége, in Belgium. 
This slag is brown, porous, and confusedly crystalline. 
1]. Anatysis. By D. F. 
1. In the first analysis an accident happened, and the lime only was de- 
termined. Weight of slag 23°63. Fused with the carbonate of potass-soda 
mixture. Sulphate of lime 15°04. 
2. Weight of slag 17°34. 
3. Silica 9°95. 
4, Alumina 2°48. 
5. Phosphate of magnesia 1°02. 
6. Oxide of manganese 0°49. 
7. Sesquioxide of iron 0°42. 
8. Potass. Weight of slag 30°40. Fused with 120 grains of carbonate of 
baryta. Chloride of potassium 0°86. 
9. Sulphur was present in very minute quantity. 
Analysis tabulated. Oxygen. 
Silica; 2 cash sey hs Ga FAA cikh dive 28°97 
ARIUS ‘ase {taailae oe ADM est. bora 8 649 
WEROIEG ca here ee ah mle ahs a) > 22°22 624 
DMB Rneaia. 7/35 ee as ce 210 O81 $09 
Protoxide of manganese... 2°52 0°56 
Protoxide of iron........ 212 0°48 
GEARS yt. naeiota sie See Els, eevee | hats Ral cst 0°30 
100°41 
As the crystallization was very confused, and as the analytical results do 
not point satisfactorily to a formula, we do not attempt to deduce any rational — 
expression of the composition of this slag. 
12. 
This specimen of “ Refinery Cinder” was produced in the Bromford Iron 
Works, near Birmingham, and was communicated by one of the proprietors, 
our friend Mr, John Dawes. The process of refining, which is not now ex- 
tensively practised in Staffordshire, consists in exposing the surface of melted 
cast iron to the action of a blast. The products are refined or white iron, 
and “ refinery cinder” or slag. 
12. AnAtysis. By D. F. 
Method of Analysis —25:178 grains were fused with 80 of the carbonate 
of potass-soda mixture and 30 of nitrate of potass. The fused mass was de- 
composed by hydrochloric acid, and the solution evaporated to dryness. The 
dry mass was digested with hydrochloric acid and filtered. The silica on the 
filter not being white, it was again fused with 40 grains of the carbonate of 
