286 7. OC. Sloane—Analysis of Bituminous Coal. 
Tellurium trioxide, re, ei 14°5°; 50794, 10°5°. Another 
ample gave 5: 111 
Barium tellurate, BaTed, “fecbly ignited, 4°5486, 10°5°; 4°5305, 
o°. Another sample gave 4°4811, 16°. This salt, ‘like the 
VI. An Analysis of Sylvanite from Colorado. 
Having had occasion lately to analyze a sylvanite from the 
Grand View Mine, Colorado, I publish the result here, not 
because it contains an ything novel, but because it seems to be 
desirable that such material should be preserved for future 
reference and discussion. The ore from this mine has, I believe, 
not been carefully analyzed before. The specimen was imbed- 
ded in quartz, associated with a ie iron pyrites, and had all 
the usual characteristics of sylvan 
The analysis came out as ‘sliowe’ after eliminating a little 
gangue. 
Tellurium See i eae 
Old... J eee 2 eae 
Silver BP LEG Hligeos? y 4. ES Ma GR Ledger his" 10°55 
TOR Oe a a ey 
Salphur .. ...<:- 5°62 
99°97 
The sulphur was not estimated directly, but was calculated 
as pyrites to correspond with the amount of iron found. Elim- 
inating the pyrites the ge will stand thus. 
Peuuram — 207 co ...-58°91 
RG a Foe 29°35 
ee ee. 2a 
100-00 
This sylvanite wy ey given me by Professor E. S. 
Wayne, of Cincinna 
Art. XXXIX.—WNotes on the Analysis o. oe Ooal; by 
T. O’Conor Stoang, A.M., aD. 
THE determination of ash in coal appears a very sl imple 
matter; yet I have on several occasions found much difficulty 
in reaching a accurate results. I traced the error finally to 
Seiesfeint pulverization of the coal. 
A sample of coal was reduced to powder and passed through 
a fine wire sieve, number sixty, or eighty, mesh. I made a 
