193 
Pag I 
"-On the Existence of Four Crvr^talline Species of Carbou," by H. C. 
Sorby,Esq., F.G.S. : 159 
On the Excavation of the Valleys in the Tabular Hills, as shown by the 
Configuration of Yedmandale, near Scai'bro',"' by H. U. Sorby, Esq.... 160 
On Fuel : its ISTature, Value, and Applicatirm," by "W. L. Simpson, Esq., 
C.E., Thurnscoc Hall, Doncaster 173 
On the Microscopical Structure of the Calcareous Grit of the Yorkshii-e 
Coast," by H. C. Sorby, Esq., F.G.S 197 
On the Use of the Barometer in Coal Mines, and a Cheap Form of 
Instrument for that Pui-pose,"' by Wm. Svkes 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 
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 Hemingfield 
Pit, belonging to Earl FitzwiUiam, at Elsecar," by B. Biram, Esq 215 
Description of an Lnprovcd Safety Valve for Steam Boilers," bv J. 
Nasmyth, Esq., C.E 218 
" On the Contorted Stratification of the Drift of the Coast of Yorkshire," 
by H. C. Sorby, Esq., F.G.S 220 
" On a Metliod of Evacuating Coal Mines of Inflammable Gas," by Dr. 
Bodington, of Sutton Coldfield 225 
"On the Oscillation of the Cm-rents di'ifting the Sandstone Beds of the 
South-East of ISTorthumberland, and on their General Direction in the 
Coal-Field in the Neighbom-hood of Edinbm-gh," by H. C. Sorby, 
Esq., F.G.S., Sheffield 230 
On Certain Cavities in the Limestone District of Craven," by Mr. Theodore 
West 242 
On the Diluvial and Gravel Beds of Yorkshire and Xottinghamshii-e," by 
the Eev. W. Thorp, of Misson Vicarage, Bawtry 224 
Address of the Chairman, John Hope Shaw, Esq., of Leeds 253 
Statement of Accounts 257 
Extracts from Miscellaneous Observations on the Manufacture of L-on, and 
especially on Certain Qualities and Properties of Malleable Iron," 
by Richard Solly, Esq., of the Lea Brook Iron Works, Staffordshire, 
and of Sheffield 257 
On a New Thermostat for Eegulating Ventilation," by William Sykes 
Ward, Esq., of Leeds '. 297 
On the Origin of Slaty Cleavage," by H. C. Sorby, Esq., F.G.S., of Sheffield. 300 
On the Discovery of Hippopotamic and other Remains found in the 
Neighbourhood of Leeds," by Mr. H. Denny, A.L.S., Leeds 321 
On the Application of Peat and its Products to Manufactui-ing, Agricul- 
tural, and Sanitary Purposes," by E. H. Durden, Esq., F.C.S., Aire- 
dale Chemical Works, Hunslet, Leed.s 339 
" On Williamson's Improved System of Colliery Ventilation," by Mr. W. H. 
J. Traice, of Leeds 366 
On the Motions of Waves, as Illustrating the Structure and Formation of 
Stratified Rocks," by H. C. Sorby, Esq., F.G.S., of Sheffield 372 
" On the Essential Condition of the Metamorphoses of Rocks," by E. W. 
Brayley, Esq., F.R.S., F.G.S., of London 379 
