704 



GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



Complete analyses of slags — The writer made the following analyses of slags, which 

 reveal a few points which had not been observed before, such as the presence of small 

 quantities of carbonate of lime and of carbon : 



Anaiysks XXX, XXXI, AXD XXXII. Slags. 

 Elementary. 



silica 



Titanic acid 



Sulphuric acid 



Carbonic acid 



Phosphoric acid 



Arsenious acid 



Chlorine and tracts Br and I (calculated) 



Sulphur 



Calcium (in the state of sulphide) 



Silver 



Gold 



Protoxide of iron 



Peroxide of iron 



Magnetic oxide of iron (re709) 



Oxide of lead 



Oxide of antimony 



Oxide of zinc 



Protoxide of manganese 



Suboxide of copper 



Lime 



Magnesia 



Alumina 



Alkalies 



Carbon 



Total 



29. 0123 



0. 5285 

 I^one 

 None 

 0. 8788 

 Trace 

 0. 0031 



1. 9110 



2. 3687 



XXXI. 



Marked trace 

 44. 6226 

 (a) 

 2. 9500 

 6. 3138 

 0. 0140 

 1. 8040 

 2. S606 

 Xoue 

 1. 9018 



1.8427 I 



Trace 



0.0195 



33. 845650 



0. 820000 



Faint trace 



Trace 



0. 657828 



0. 024147 



0. 004686 



0. 914418 



1. 143022 



0. 014266 



Trace 



36. 789600 



(a) 



3. 419000 



4. 326576 

 Trace 



2. 353500 

 4. 259378 



None 

 6. 539400 



3. C71935 

 1.182030 



Trace 

 0. 034500 



31. 10656 

 0. 57300 

 Trace 

 Trace 



0. 32204 

 Trace 



0. 00184 



1. 27277 

 1. 59096 

 0. 00562 



Trace 

 34. 40836 



2. 71000 

 (6) 



3. 31746 

 Trace 

 1. 04100 

 1. 15720 

 0. 04950 

 10, 28020 

 9. 75340 

 2. 33500 

 Trace 

 0. 07500 



ain magnetic oxide. 



b Keported with FeO and FesOs. 



