548 GEOLOGY OF OHIO. 
The distribution of the’ lime, alumina and silica would be as fol- 
lows, taking the analyses given as correct : 
Silica. Alumina, Lime. 
ORC Me ccsgcosetisedessaecaeneeesescnntesnnetaneades oenercnesene 118.8 tons. | 55.2 tons. | 10.0 tons. 
Cindcus Lautlecd atta ants. tices od aeetadte came tartare 55.8 f Co Bere ol are Rey 
Coalfashicn ty tanec. ewe lenis steers tee BOC EDROCCAE 26.4 “ GIS aie 7340) 
Wimvestomemenassctesece en: Re BAERS AAR Er Leg ie Ws} & iy 227.2 * 
Wotal aisihscccseyesccsmaes cs ctoeek seeececaetaiesee | 213.8 tons. BAB tone. 241.6 tons. 
From this silica it is necessary to deduct what goes into the pig- 
iron, or 25.8 tons, leaving 188 tons silica for slag. The comparative 
percentage calculated from this would be: 
1 2 
SICA wscteGaerenecceciecacsueeese ste Cslesh oetictinncenoaseacts lcs ctememecdaccmeee seme 36.4 38.1 
ATOM AN)... 0:cttisatewnsinsiargareleelss vwaeasvivumaesie ntiods delteuseneedelcdecacasnecodcaenes 16.2 16.0 
Bimen (Magnesia)... ccccessceecsstescusecsmecenseves tosomscesscest coencemene eee ATA 43.5 
. Oxide iron, Manganese, C£C............rerrercerreerrereeseereeeesseeeesees| conse eceeeeees 2.0 
No. 2 is an analysis of a slag from a coal furnace; it serves to show 
that the character of the slag found corresponds to practice. HExamin- 
ing these results, it is evident that the slag is very fine and produced 
in very large quantity. Furthermore, the ash of the coal included 
above does not become a part of the slag until the fuel is burned at the 
tuyeres. Now, if these coal ashes are omitted from the above slag cal- 
culation, the resultant slag would be decidedly (4) lower in alumina and 
also in silica (about +). : 
Now, while these slags form a very liquid compound, they require 
a very high temperature for their formation and fusion, and hence it 
would appear, require a very hot hearth for their melting. The silica 
in the coal ash at this high temperature is almost immediately reduced, 
and goes to the iron. ‘The extremly basic slags are necessary to pre- 
