TORBANEHILL MINERAL AND OF VARIOUS KINDS OF COAL. 
Pu are I. Fig. 
Fig. 
Fig. 
Fig. 
g. 3. Longitudinal section of the same coal. 
. 4, Transverse section of the Wemyss cannel coal, showing, 
g. 5. Longitudinal section of the Wemyss cannel coal. 
. 7. Longitudinal section of the Lesmahagow cannel coal. 
. 9. Longitudinal section of the brown Methil coal. 
185 
Description of the Plates. 
1. Transverse section of Buccleuch or Dalkeith coal, magnified 80 diameters linear. 
It displays imbedded in the bistre-brown mass, 1st, The rings described in the 
text ; 2dly, The reddish masses supposed to be resin cells; and, 3dly, The 
large circles considered to be sections of spore cases. 
. 2. Another portion of the same section, magnified 200 diameters linear, showing 
more particularly the appearance of the rings held to be characteristic of coal. 
200 diameters linear. 
in addition to the rings, 
several bituminoid masses. 200 diameters linear. 
200 diameters linear. 
. 6. Transverse section of the Lesmahagow cannel coal, showing a less number of the 
rings, but a greater number of the bituminoid masses. 200 diameters linear. 
200 diameters linear. 
. 8. Transverse section of the Brown Methil coal, showing very few of the rings, but a 
greatly increased number of the bituminoid masses. 200 diameters linear. 
200 diameters linear. 
10. Transverse section of the darker coloured Torbanehill mineral, showing the bitu- 
minoid masses imbedded in clay. No rings are anywhere visible. 200 diameters 
linear. 
11, Transverse section of the lighter coloured Torbanehill mineral, showing the deep 
orange-coloured masses, and the melting together of the bituminoid masses. 200 
diameters linear. 
In these sections it will be observed, that common coal abounds in the rings, 
and possesses no bituminoid bodies. The cannel coals have rings and 
bituminoid budies, whilst the Torbanehill mineral is principally composed 
of the bituminoid masses without any rings at all. It will be further seen, 
that in different cannel coals these various elements vary greatly in 
amount. 
12. Transverse section of the Torbanehill mineral, at the upper portion of the seam, 
where veins of coal run through it. 200 diameters linear. 
Prare II. Fig. 1. Bituminoid masses imbedded in the clay of the Torbanehill mineral, at the edge 
of a section, magnified 750 diameters linear, to show their racinted texture, 
and mode of fracture. 
Fig. 2. Section of the lighter coloured Torbanehill mineral, in which a plant is imbedded, 
, showing the scalariform vessels. 200 diameters linear. 
Fig. 3. Ashes of the Zetland coal, showing mineral masses and spicula, black fibres and 
plates, perforated with round openings. 200 diameters linear. 
Fig. 4. Ashes of the Torbanehill mineral, showing their amorphous structure. 200 
VOL. XXI. PART I. 
diameters linear. 
3D 
