204 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



Incineration. 



6-44 grs. gave of Ash, 0-28, or 4*34 per 100. 

 2-26 grs. do. 0*11, or 4-86 do. 



Mean - - - 4 60 do. 



2. Mauch Chunk, or Pennsylvanian Anthracite. Lustre somewhat 

 glistening ; powder much blacker than that of the preceding variety. 



1st Analysis. 

 6 '92 grs. gave 



Water, 1-50 = Hydrogen, 0-166, or 2-398 per 100. 



Carbonic Acid, 21 -44= Carbon, 5*847, or 84-49 do. 



2d Analysis. 

 6*02 grs. gave 



Water, 1*33 = Hydrogen, 0-147, or 2-441 per 100. 



Carbonic Acid, 18 -75 = Carbon, 5'113, or 84-93 do. 



3c? Analysis. 

 6*127 grs. gave 



Water, 1*41 = Hydrogen, 0-156, or 2*546 per 100. 



Carbonic Acid, 19-11 = Carbon, 5'211, or 85-04 do. 



Nitrogen Analysis. 



I heated some of the coal on a test-tube with soda-lime. Red litmus paper 

 was immediately turned blue ; and, on holding the stopper of the hydrochloric 

 acid bottle over the tube, dense white fumes appeared. The coal, therefore, con- 

 tained nitrogen. 



7*18 grs. gave 



Metallic Platinum, 0*616 = Nitrogen, 0*0874, or 1*217 per 100. 



Incineration. 



18-17 grains gave of Ash, 1*85, or 10*18 per 100. 

 6*75 do. 0*69, or 10*22 do. 



Mean - 10-20 



3. Frostburgh, Maryland. Colour of powder, brownish black, 



1st Analysis. 

 4*85 grs. gave 



Water, 2*10= Hydrogen, 0*233, or 4*804 per 100. 



Carbonic Acid, 13*91 = Carbon, 3*793, or 78*20 do. 



2c? Analysis. 

 6*54 grs. gave 



Water, 2*92 = Hydrogen, 0*324, or 4*954 per 100. 



Carbonic Acid, 18*89= Carbon, 5 151, or 78*76 do. 



3c? Analysis. 

 5-889 grs. gave 



Water, 2*45 = Hydrogen, 0*272, or 4*618 per 100. 



Carbonic Acid, 17 *03 = Carbon, 4*644, or 78*85 do. 



Nitrogen Analysis. 

 6*83 grs. gave of 



Metallic Platinum, 1*1 45 = Nitrogen, 0'162, or 2*37 per 100. 



