upo7i the Composition of Coal. 1 27 



I. II. III. 



Carbon 82-813 83-230 82-730 



Hydrogen 5-562 5-4<42 5-469 



Azote and oxygen 10-497 10-200 10-673 



Ashes 1-128 1-128 1-128 



100-000 100-000 100-000 



The relation of the carbon to the hydrogen in this speci- 

 men is as 1-231 : I'OOO or 5 : 4. 



II. VARIETY. — CANNEL COAL. 



1. Specimen from, Lancashire. 



The locality of this specimen is Wigan, where it has for a 

 long time been worked. From its capability of receiving a 

 fine polish, it is made into toys, &c. 



Its colour is greyish black ; the lustre is highly glistening ; 

 fracture is large conchoidal. It is not so hard as the splint 

 coal and is sectile. Specific gravity 1-319. 



The ashes determined in the usual way were: 



I. -1706 grm. coal left as residue... -0043 grm. 

 II. •1825grm -0047 grm. 



•3531 -0090 



which amounts to 2-548 per cent. 



Burnt with chromate of lead in the usual way : 

 I. -2937 grm. coal gave -890 grm. COo 



II. -3178 grm -962 grm. COg and -1624 grm. HgO 



III. -2819 grm -8545 grm. CO2 and -1432 grm. HgO 



or in 100 parts 



I. II. III. 



Carbon 83-789 ... 83-698 ... 83-808 



Hydrogen 5-677 ... 5*643 



Azote and oxygen 8-077 ... 8-001 



Ashes 2-548 ... 2-548 ... 2-548 



100-000 100-000 



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

 1-207 : 1-000 or 6 : 5. 



2. Specimen from Edinburgh. 



This coal is called in Scotland Parrot coal^ because its 

 particles, when heated, fly off from one another with a crack- 

 hng noise. It occurs in many of the series in the Edinburgh 

 coal field. It splits easily, and throughout its substance se- 



