IV 
Page. 
" On the Existence of Four Crystalline Species of Carbon," by 
H. C. Sorby, Esq., F.G. S 159 
" On a New Gas Stove," by William Sykes Ward, Esq 168 
" On the Excavation of the Valleys in the Tabular Hills, as shown 
by the Configuration of Yedmandale, near Scarbro'," by H. C. 
Sorby, Esq 169 
" On Fuel : its Nature, Value, and Application," by W. L. Simpson, 
Esq., C.E., Thurnscoe Hall, Doncaster 173 
Meeting at Sheffield, June 5th, 1851 — 
" On the Microscopical Structure of the Calcareous Grit of the 
Yorkshire Coast, by H. C. Sorby, Esq., F.G.S 197 
" On the Use of the Barometer in Coal Mine9, and a Cheap Form of 
Instrument for that Purpose," by Wm. Sykes Ward, Esq., F.C.S., 
of Leeds 206 
" On some Phenomena and Experiments upon Capillary Attraction," 
by Mr. Thomas J. Pearsall, F.C. S., of Leeds 209 
Meeting at Bradford, October 17th, 1851 — 
Statement of Accounts 213 
" Description of a Direct- Acting Steam Fan for the Better Ventilation 
of Coal Mines," by J. Nasmyth, Esq., of Patricroft, Manchester 214 
" Description of the Fan erected for the Ventilation of the Heming- 
field Pit, belonging to Earl Fitzwilliam, at Elsecar," by B. 
Biram, Esq 215 
" Description of an Improved Safety Valve for Steam Boilers," by 
J. Nasmyth, Esq., C.E 218 
" On the Contorted Stratification of the Drift of the Coast of York- 
shire," by H. C. Sorby, Esq., F.G.S , 220 
Meeting at Huddersfield, April 15th, 1852 — 
" On a Method of Evacuating Coal Mines of Inflammable Gas," by 
Dr. Bodington, of Sutton Coldfield 225 
" On the Oscillation of the Currents drifting the Sandstone Beds of 
the South- East of Northumberland, and on their General Direc- 
tion in the Coal Field in the Neighbourhood of Edinburgh," by 
H. C. Sorby, Esq., F.G.S., Sheffield 232 
" On Certain Cavities in the Limestone District of Craven," by 
Mr. Theodore West 240 
" On the Diluvial and Gravel Beds of Yorkshire and Nottingham- 
shire," by the Rev. W. Thorp, of Misson Vicarage, Bawtry 244 
Meeting at Leeds, December 15th, 1852 — 
Address of the Chairman, John Hope Shaw, Esq., of Leeds 253 
