CONTENTS (continued). 



January 31, 1884. 



PAGE 



I. Determination of the Vertical and Lateral Pressures of Granular Sub- 

 stances. By Isaac Eobeets, F.O.S., F.R.A.S 225 



II. Notes on the Microscopic Structure of some Rocks from the Andes of 

 Ecuador, collected by E. Whymper, F.R.Gr.S. No. I. Pichincha. 

 By Professor T. a. Bonney, D.Sc, F.R.S. . . . . . .241 



III. Report on the Tidal Disturbances caused by the Volcanic Eruptions at 

 Java, August 27 and 28, 1883, and the Propagations of the " Super- 

 tidal" Waves. By Major A. Baied, R.E 248 



List of Presents 253 



On a New Standard of Illumination and the Measurement of Light. By 



William Heney Peeece, E.R.S 270 



February 7, 1884. 



L On the Motion of Fluid, part of which is moving Rotationally and part 

 Irrotationally. By M. J. M. Hill, M.A., Professor of Mathematics at 

 the Mason Science College, Birmingham 276 



II. Supplementary Note on the Constitution of Chlorophyll. By Edwaed 



Schunck, E.R.S 285 



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