Mr. Richardson on the Composition of Coal. 409 



The relation of the carbon to the hydrogen in this specimen is as 1-370 : 1-000 or 4T10 : 

 3-000. 



2. Specimen from Glasgow. 



The greater portion of the Coal obtained from Glasgow consists of this species ; it con. 

 stitutes the chief part of the four uppermost beds. 



Colour is jet black ; lustre not so splendid 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. -1810 grm. coal left as residue -0025 grm. 



•4220 0060 



This is equivalent to 1-421 per cent. 



Burnt with chromate of lead. 



I. -278 grm. coal gave -8148 grm. co 2 - and -1379 grm. h 2 o. 



II. -308 grm. coal gave -2023 grm. co 2 . and -1424 grm. h„o. 



III. -2 721 grm. coal gave -7983 grm. co 2 . and -1338 grrn. h 2 o. 



which produces in 100 parts 



I. II. III. 



Carbon, 81-041 81-450 81-121 



Hydrogen, 5-509 5-387 5461 



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



Ashes, 1-421 1-421 1-421 



100000 100 000 100-000 



The relation of the carbon and the hydrogen in this coal is as 1-216: 1 000 or 6 : 5. 

 There is again a difference in the specimens of this species analysed. 



IV. Variety. — Caking Coal. 

 1. Specimen from Garesfield, near Newcastle. 

 This specimen was obtained from one of the lowest seams in the Newcastle Coal Field- 

 This coal is of a rich bituminous nature, caking or melting when heated ; it is from this 

 property that it receives its name. 



Colour is black, lustre is shining, resinous, principal fracture is straight, cross fracture 

 is uneven and cross-grained. The fragments have more or less a cubic shape. It is soft 

 and very easily frangible, sectile. Specific gravity 1-280. 

 Estimation of the ashes: — 



1. -2080 grm. coal lett as residue -0029 grm. 

 II. -2800 grm. coal left as residue -0039 grm. 



•4880 -0068 



