126 Mr. T. Richardson's Researches 



by the river Tyne cutting through it. Colour black ; lustre 

 glimmering; difficultly frangible; principal fracture imperfect 

 conchoidal; ciross fracture uneven and splintery; specific gra- 

 vity 1-302. 



The determination of the ashes, as already described, was 



I. r234-grm. coal left as residue 'ITlSgrm. 



II. •OSG'igrm '0122 grm. 



1-3204 -1837 



which amounts to 13-912 per cent. 



Burnt in the usual way with oxide of copper : 

 I. -270 grm. coal gave -732 grm. COg and -1 52 grm. Hg O 



II. -252 grm -678 grm. COg and -1385 grm. Hg O 



Burnt v/ith chromnt^-of lead in the manner to be described: 



III. •3414-grm. coal gave -927gnn.C02and •1922grm.H20 



IV. •3955grm l-0703grm.CO2and-2i76grm.H2O 



These results give in 100 parts : 



I. II. III. IV. 



Carbon 74-961 74*381 75-071 74-878 



Hydrogen 6-254 6-111 6*243 6-114 



Azote and oxygen 4-873 5-596 4-774 5*096 



Ashes 13-912 13-912 13*912 13*912 



100*000 100*000 100-000 100*000 



The relation of the carbon and hydrogen is clearly as 1 : 1. 



2. Specimen from Glasgow. 

 The splint coal occurs associated with cherry coal in the 

 Glasgow coal field. The fifth bed is almost entirely consti- 

 tuted of this species. It is very highly esteemed for manu- 

 facturing and household purposes. Colour is black, with a 

 little brown ; lustre glimmering ; difficultly frangible ; frac- 

 ture uneven and splintery ; specific gravity 1*307. 

 Ashes determined in the usual way gave — 



I. -214 grm. coal left as residue '0024 grm. 

 II. -238 grm -0027 grm. 



•452 -0051 



which amounts to 1*128 per cent. 



Burnt with chromate of lead as usual — 

 I. •2798grm. coal gave •838grm. CO2 and -1401 grm. HgO 



II. -2596 grm -7818grm. COsand *1272grm. H2O 



III. •2378grm -7115grm. COgand -U71grm. HgO 



which yields in 100 parts. 



