[No. 245 to follow. 



PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. xli. No. 246. 



CONTENTS. 



PAGE 



On Underground Temperatures ; with Observations on the Conductivity of 

 Rocks j on the Thermal Effects of Saturation and Imbibition ; and on a 

 Special Source of Heat in Mountain Eanges. By Joseph Prestwich, 

 M.A., E.R.S., E.G.S., &c , .. 1 



On the Agency of Water in "Volcanic Eruptions ; with some Observations on 

 the Thickness of the Earth's Crust from a Greological Point of View ; and 

 on the Primary Cause of Volcanic Action. By Joseph Pbestwich, 

 M.A., E.R.S., E.a.S., &c. (Plate 1) 117 



Price Six Shillings. 



