upon the Composition of Coal, 129 



I. •4164' grm. coal gave 1*2755 grm.CO^and'lSQBgrm.HgO 



II. -SlUgrm •9573grm. COaand-UUgrm. HgO 



expressed in 1 00 parts : 



I. II. 



Carbon 84.-691j ... 84-998 



Hydrogen 5-054 ... 5-043 



Azote and oxygen 8*576 ... 8-283 



Ashes 1-676 ... 1-676 



100-000 100-000 



The relation of the carbon to the hydrogen in this specimen 

 is as 1-370 : 1-000 or 4*110 : 3*000. 



2. Specimen Jrom Glasgow. 



The greater portion of the coal obtained from Glasgow 

 consists of this species; it constitutes the chief part of the 

 four uppermost beds. 



Colour, jet black ; lustre, not so splendent as that of Jarrow. 

 In its other characters it is quite the same as the preceding 

 specimen. Specific gravity 1-268. 



The determination of the ashes was as follows : 



I. -2410 grm. coal left as residue -0035 grm. 

 II. •1810grm -0025 grm. 



*4220 *0060 



which is equal to 1*421 per cent. 



Burnt with chromate of lead: 



I. *278 grm. coal gave -8148 grm. CO^ and -1379 grm. HgO 



II. -308 grm -9073 grm. CO^ and -1494 grm. HgO 



III. -2721 grm -7983 grm. CO^ and -1338 grm. HgO 



which produces in iOO parts : 



I. II. III. 



Carbon 81-041 ... 81-450 ... 81*121 



Hydrogen 5*509 ... 5*387 ... 5*461 



Azote and oxygen 12*029 ... 11-742 ... 11-997 



Ashes 1*421 ... 1*421 ... 1*421 



100-000 100-000 100-000 



The relation of the carbon to the hydrogen in this coal is as 

 1-216 : 1-000 or 6 : 5. This relation differs from that of the 

 preceding specimen of this species. 



IV. VARIETY — CAKING COAL. 



1. Specimen from Garesfield, near Newcastle. 



This specimen was obtained from one of the lowest seams 

 Phil, Mag. S. 3. Vol. 13. No. 80. Aug. 1838. K 



