54 
The Chairman observed that deterioration in the quality of coal 
exposed to the air had long been observed by those who had the charge 
of engine-boilers. 
Mr. Walter Eowley called attention to the difference in volatile 
matter between the "hard" and "soft" divisions of the Barnsley Thick 
Seam. 
In the absence of the author, a paper on "The Geology of Craven," 
by Mr. W. H. Dalton, of the Geological Survey, was read by Mr, 
C. Callaway, M.A. (See page 16.) 
Mr. L. C. MiALL called attention to the many points of interest 
presented by this paper. The announcement t)f Silurian slates in 
Gordale was doubtless novel to all present.* A few remarks on the- 
increasing simplicity of the Lower Carboniferous Series as we go south- 
wards from the North Eiding to South Craven were added. 
Specimens illustrative of various parts of the paper were then- 
exhibited by Mr. Miller. 
A paper on " The Structure of Ganoid Fishes, introductory to an 
Account of the Ganoid Fishes of the Yorkshire Coal-Field," was then 
read by Mr. L. C. Miall. (See page 24.) 
Mr. W. Pengelly, F.E.S., made a few observations, after which 
the Society adjourned. 
At three o'clock a luncheon, kindly provided by Mr. John BrIgg, 
the chairman of the meeting, was served in the exhibition-room. 
* A minute isolated patch of Silurian Rocks in the neighbourhood of Gordale 
is shewn in Prof. Phillips' coloured Geological Map of Yorkshire. 
