128 Mr. T. Richardson's Researches 



veral well-defined impressions of S^z^vwana^co/rf^s are found. 

 Colour is black with gray ; lustre approaches that of glisten- 

 ing; fracture, imperfect conchoidal; sectile and frangible; 

 specific gravity, 1*318. 



The determination of the ashes was as follows : 



I. '2007 grm. coal left as residue '0295 grm. 



II. 'ISSSgrm -0268 grm. 



•3865 -0563 



This amounts to 14<'566 per cent. 

 Burnt with chromate of lead: 

 I. -3022 grm. coal gave -737 grm. CO2 and •1468 grm. HgO 

 II. •294. grm. •7205grm.CO2 and -1434 grm. H2O 



Expressed in 100 parts. I. II. 



Carbon 67*434 ... 67*760 



Hydrogen 5^394 ... 5*416 



Azote and oxygen 12*606 ... 12-258 



Ashes 14*566 ... 14*566 



100*000 100*000 



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

 men as 1*020 : 1000 or 1 : 1. This differs from the cannel 

 coal from Lancashire, but agrees with the splint coal of Wy- 

 1am Banks, near Newcastle. Between the splint and cannel 

 coals there is at all times much similarity, and this is counte- 

 nanced again by the above results. 



III. VARIETY. — CHERRY COAL. 



1. Speci7nenfrom Jarrow, near Newcastle. 



This species of coal occurs more or less in every coal field, 

 often forming thin beds or layers in the midst of other coals. 

 The specimen submitted to analysis was obtained from a thin 

 seam passed through while sinking the shaft of the mine 

 deeper. Colour, beautiful jet black ; lustre, resinous, splen- 

 dent; principal fracture, straight, uneven; cross fracture, 

 conchoidal; not very hard and easily frangible; specific 

 gravity, 1*266. 



The determination of the ashes was as follows : 



I. *2567 grm. coal left as residue '0045 grm. 

 II. -3457 grm *0056 grm. 



•6024 '0101 



amounting to 1 *676 per cent. 

 Burnt with chromate of lead. 



