EXPLANATION OF THE PLATES 

 Illustrating Dr. Redfern's Paper. 



The drawings from which the Plates were executed were made by the 

 camera lucida, under a power of 140 linear diameters. Scales having 

 reference to the different figures are appended to each Plate, The whole 

 of the figures in Plates VII. VIII. and the first four in Plate IX. are 

 represented in the lithographs as magnified 180 diameters. Figs. 5 and 6 

 of Plate IX. are only enlarged 50 diameters, and have a separate scale 

 below them. 



PLATE VII. 



Fig. 



1. — Horizontal section of Torbanehill coal, 2 inches from the top of the 

 seam, showing a three-lobed yellow patch with its radiate lines, 

 and a mass of substance in which the yellow matter is imperfectly 

 marked out into rounded or angular spaces by darker bands. 



2. — Vertical section at the same part, showing irregularly elongated 

 yellow and reddish patches, bounded by dark lines, running in 

 the direction of the laminae of bedding ; also a crystal, which 

 polarises light very powerfully. 



3. — Horizontal section of the same block of coal 16 inches from the top, 

 showing irregularly rounded yellow bodies with dark outlines ; 

 much smaller j^olygonal spaces of more uniform size ; and a sec- 

 tion of a rounded vegetable capsule like a spore. 



4. — Vertical section at the same part as the last, showing the yellow 

 bodies elongated in the direction of the laminae of bedding, with 

 their dark-brown boundaries projecting at the free edge, like 

 pieces of membrane or fibre. 



5. — Horizontal section, and 6, vertical section, of Wemyss coal, showing 

 yellow bodies with radiate lines, similar to those in the Torbane- 

 hill coal, and like them rounded on horizontal sections and 

 elongated on vertical ones. 



PLATE VIII. 



1 and 2. — Horizontal and vertical sections of Methill coal. 



3 and 4. — Horizontal and vertical sections of Capledrae coal, showing, as 

 well as the sections of Methill coal, similar yellow bodies to those 

 in the Torbanehill coal, rounded on horizontal sections, and 

 elongated in the direction of the laminae of bedding on vertical 

 sections. 



5. — Shows spherical or polygonal membranous capsules, tubercular or 

 pilose on the surface (spores ?), found in great numbers on all thin 

 horizontal sections of Torbanehill coal. 



6. — Similar bodies seen on vertical sections of the same coai. 



