130 Mr. T. Richardson's Researches 



in the Newcastle coal field. This coal is of a rich bituminous 

 nature, caking or melting when heated ; it is from this pro- 

 perty that it receives its name. 



Colour, black; lustre, shining, resinous ; principal fracture, 

 straight ; cross fracture, uneven and cross-grained ; the frag- 

 ments have more or less a cubical shape ; soft and very easily 

 frangible ; sectile. Specific gravity 1 '280. 



The estimation of the ashes was as follows : 



I. '2080 grm. coal left as residue '0039 grm. 



II. -2800 grm -0029 grm. 



•4880 -0068 



which amounts to 1*393 per cent. 

 Burnt with chromate of lead : 

 I. '2977 grm. coal gave •9454- grm. COg and '1383 grm. H^O 



II. -3149 grm 1-0035 grm. COg and '1509 grm. H2 O 



or in 100 parts : 



I. II. 



Carbon 87*809 ... 88*095 



Hydrogen , 5-159 ... 5*320 



Azote and oxygen 5*639 ... 5-192 



Ashes 1-393 ... 1*393 



100*000 100*000. 



The relation between the carbon and hydrogen in this speci- 

 men is as 1-377 : 1*000 or 4 : 3. 



2. Specimen from South Hetton. 



This coal occurs in the county of Durham, and is worked 

 through the magnesian limestone. It is regarded as one of 

 the best coals. Its characters perfectly correspond with 

 those of the preceding specimens. Specific gravity r2'74. 



The ashes determined in the usual way were as follows : 



I. -2400 grm. coal left as residue ... -0060 grm. 

 II. -2604 grm *0066 grm. 



•5004 -0126 



which amounts to 2-519 per cent. 

 Burnt with chromate of lead : 

 I. -2929 grm. coal gave *8855grra. CO<^ and -1358 grm.H^O 



II. -2705 grm •8116grm.C02and-1265 grm.HgO 



expressed in 100 parts: 



