DESCEIPTION OF PLATES III, IV., & V. 
Illustrating Professor Queketf s Papers on the Torbane-hill 
Mineral. 
PLATE III. 
1. — A section of the yellow variety of the Torbane-hill Mineral, as seen 
under a magnifying power of 130 diameters. 
2. — A section of the dark variety of the Torbane-hill Mineral, as seen 
under a power of 130 diameters. The yellow circular masses exhibit 
a radiated structure ; they form the combustible portion of the 
mineral, whilst the dark matter is the earthy ingredient. 
3. — A section of the Torbane-hill Mineral, in which a specimen of 8tig- 
maria ficoides is imbedded : every part of this plant can be readily 
distinguished from the mineral by its rich brown colour. Mag- 
nified 6 diameters. 
4. — A portion of the same specimen magnified 50 diameters, showing how 
easily the smallest portion of vegetable tissue can be distinguished 
from the substance of the mineral. 
5. — A section of the Torbane-hill Mineral, through which a thin layer of 
coal ran, which may be readily recognised by its brown colour. 
The yellow particles of the mineral in contact with the coal are of 
more or less oval figure. 
6. — The powder of Torbane-hill Mineral, showing the yellow bituminous 
particles, and fragments of vessels. 
7. — Ash of the Torbane-hill Mineral. 
PLATE lY. 
1. — Transverse section of the Brown Methil Coal. 
2. — Longitudinal section of the same. 
3. — Transverse section of the Black Methil Coal. 
4. — Longitudinal section of the same. 
5. — Transverse section of the Lesmahagow Cannel Coal. 
6. — Longitudinal section of the same. 
PLATE V. 
1. — A section showing the Mineral and Coal in juxtaposition ; magni- 
fied 3 diameters. 
2. — Eepresentations of the comparative sizes of the transverse sections of 
the brown elongated cells from various Coals, drawn by means of 
the camera lucida, by Dr. Adams, 70 diameters. 
3. — Chippings of Newcastle Coal, showing dotted woody tissue. 
4. — Ash of common domestic Coal, exhibiting the remains of a transverse 
section of wood. 
5. — A longitudinal section of Coal from Lochgelly, showing its identity 
with a similar section of wood, from a drawing in the possession of 
Dr. Adams. 
6. — Ash of Coal, exhibiting portions of siliceous cuticle and other frag- 
ments of vegetable tissue foreign to the coal. 
7. — Powder of Breadisholme Coal, from a drawing by Dr. Adams. 
