CONTENTS. 

 VOL. XLI. 



No. 246. 



Page 



On Underground Temperatures ; with Observation on the Conductivity 

 of Eocks ; on the Thermal Effects of Saturation and Imbibition ; and 

 on a Special Source of Heat in Mountain Banges. By Joseph 

 Prestwich, M.A., F.B.S., F.G.S., &c 1 1 



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

 on the Thickness of the Earth's Crust from a Geological Point of 

 View ; and on the Primary Cause of Volcanic Action. By Joseph 

 Prestwich, M.A., F.E.S., F.G.S., &c. (Plate 1) 117 



No. 247. 



Preliminary Eeport on the Pathology of Cholera Asiatica (as observed in 

 Spain, 1885). By C. S. Boy, F.E.S., J. Graham Brown, M.D., &c, and 

 C. S. Sherrington, M.B. 173 



An Instrument for the Speedv Volumetric Determination of Carbonic 

 Acid. By William Marcet, M.D., F.E.S. (Plate 2) 181 



Eesearches in Stellar Photography. 1. In its Eelation to the Photometry 

 of the Stars ; 2. Its applicability to Astronomical Measurements of 

 Great Precision. By C. Pritchard, F.E.S. , Savilian Professor of 

 Astronomy in Oxford 195 



Contribution to the Study of Intestinal Eest and Movement. By J. 

 Theodore Cash, M.D , 212 



On the Practical Measurements of Temperature. Experiments made at 

 the Cavendish Laboratory, Cambridge. By H. L. Callendar, B.A., 

 Scholar of Trinity College, Cambridge 231 



The Determination of Organic Matter in Air. By Professor Thos. 

 Carnelley, D.Sc, and Wm. Mackie, M.A., University College, Dundee. 238 



