25 
Mr. Morton said that he had not condemned the reflector, 
which was part of the suggestion of Mr. Hartop ; but he 
read an extract from Sir Humphrey Davy's account of the 
safety-lamp to show that he had himself suggested a semi- 
circular cylinder as an additional protection, but that he 
had not found it to answer. 
Mr. Hartop and Mr, Morton explained, and the discussion 
terminated. 
MR. EMBLETON ON THE STRATA IN THE NORTHERN YORK- 
SHIRE COAL FIELD. 
Mr. Embleton next read his paper, illustrated by sec- 
tions " On the Order of Succession of the Coal Seams in 
the Northern Coal Field of Yorkshire." The subject 
of discussion on this paper was confined to a conside- 
ration of the order of the various seams found in the 
Township of Whitwood, Methley, Stanley, Wrenthorpe, 
Lofthouse, Rothwell, Ardsley, Middleton, and Beeston. 
Mr. Embleton commenced his paper by saying it would be of 
great importance to the society if the order of the seams of 
coal were determined in each district, and that it was the 
only sure foundation for comparison with distant parts of 
the coal field. He remarked that it was only by a careful 
collection of shaft sections that many important questions 
in local geology could be satisfactorily cleared up. As for 
instance, the thinning or thickening of certain seams in 
particular directions, the existence of seams at one colliery 
which were not found in an adjoining one, the origin of coal 
itself. They would also show when that variety of coal, 
called cannel coal, was chiefly found, and whether, as had 
been often stated, though, perhaps, without much founda- 
tion, it was only found in the vicinity of certain throws. 
The workable seams in the Townships before mentioned are 
the Stanley Shale Coal, the Stanley Main Coal, the War- 
renhouse Coal, the Lofthouse or Haigh Moor Coal, the Fish 
Coal, the 40 Yards Coal, the Yard Coal or Little Coal, and the 
Main or Deep Coal of the Rothwell Haigh and Middleton 
Collieries, the Eleven Yards Coal, and the Beeston Coal 
Of these seams, the 40 Yards Coal, the Yard Coal, the 
Main Coal, and Beeston Coal supply Leeds with fuel, both for 
domestic and for manufacturing purposes. The necessity 
