PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. xxxiii. No. 217. 



CONTENTS. \<i^r o n-Tj 

 December 8, 1881. 



p *i4 N : PAGE 

 I. On the G-enus Culeolus. By W. A. Heedman, D.Sc, F.L.S., 



F.R.S.E., Demonstrator of Zoology in the University of Edinburgh . 104 



II. On the Development of the Skull in Lepidosteus osseous. By W. K. 



Paekee, F.E.S. .......... .107 



III. On the Structure and Development of Lepidosteus. By E. M. 



Baleoue, LL.D., F.R.S., and W. W. Paekee. 112 



IV. On a New Mineral found in the Island of Cyprus. By Patjlfs E. 



Reins ch (Erlangen) 119 



V. On certain points in the Anatomy of Chiton. By Adam Sedgwick, 



M.A., Fellow of Trinity College, Cambridge 121 



VI. The Action of Cutting Tools. By A. Mallock 127 



VII. On Seismic Experiments. By John Milne, E.G-.S., and Thomas 



GrEAY, B.Sc, F.R.S.E 139 



VIII. On the Electrolytic Diffusion of Liquids. By G. Goee, LL.D., E.R.S. . 140 



IX. On the Coefficients of Contraction and Expansion by Heat of the 

 Iodide of Silver, Agl, the Iodide of Copper, Cu 2 I 2 , and of Eive 

 Alloys of these Iodides. By G. F. Rod well, F.B.A.S., F.C.S., 

 Science Master in Marlborough College 143 



X. On the Vibrations of a Vortex Ring, and the Action of Two Vortex 

 Rings upon each other. By J. J. Thomson, B.A., Fellow of Trinity 

 College, Cambridge 145 



XI. Letter addressed to the Secretary R.S. by Dr. W. Robeets, E.R.S. . 147 

 For continuation of Contents see 4th page of Wrapper. 



Price Five Shillings. 



