J. I* 



CONTENTS, 

 VOL. XXXIV. 



No. 220.— April 20, 1882. 



Page 



On the Formation of Eipplemark. By Arthur E. Hunt, M.A., F.G.S 1 



Note on General Duane's Soundless Zones. By Dr. John Tyndall, F.E.S. 18 



April 27, 1882. 



On the Attitudes of Animals in Motion. By Eadweard Muybridge, of 

 Palo Alto, California 20 



Preliminary Account of the Structure of the Cells of the Liver, and the 

 Changes which take place in them under Various Conditions. By J. 

 N. Langley, M. A., Fellow of Trinity College, Cambridge 20 



May 4, 1882. 



List of Candidates for Election 27 



On the Specific Eesistance of Mercury. By Lord Eayleigh, F.E.S., Pro- 

 fessor of Experimental Physics in the University of Cambridge, and 

 Mrs. H. Sidgwick 27 



May 11, 1882. 



Sur l'lnversion Generale. Par T. S. Vanecek 2.9 



On the Organization of the Fossil Plants of the Coal-measures. Part XII. 

 By Professor W. C. Williamson, F.E.S 31 



May 25, 1882. 



On certain Geometrical Theorems. No. 2. By W. H. L. Eussell, F.E.S. 35 



Note on Mr. Eussell's paper " On certain Geometrical Theorems. No. 2." 

 By William Spottiswoode Pres. E.S 37 



