PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol, xlii. No. 252. 



CONTENTS. 



February 3, 1887. 



PAGE 



I. On the Waves produced by a Single Impulse in Water of any Depth, or 



in a Dispersive Medium. By Sir W. Thomson, Knt., LL.D., F.R.S. . 80 



II. On the Formation of Coreless Yortices by the Motion of a Solid through 



an inviscid incompressible Fluid. By Sir W. Thomson, Knt., LL.D., 

 F.R.S .83 



III. On Froterosaurus Speneri (von Meyer). By H. Gh Seelet, F.R.S. , 



Professor of Geography in King's College, London .... 86 



List of Presents .86 



February 10, 1887. 



I. Contributions to the Metallurgy of Bismuth. By Edwaed Matthet, 



F.S.A., F.C.S., Assoc. Eoy. Sch. Mines .89 



II. An Inquiry into the Cause and Extent of a special Colour-Relation 

 between certain exposed Lepidopterous Pupae and the Surfaces which 

 immediately surround them. By Edwaed B. Pouiton, M. A., of Jesus 

 and Keble Colleges, Oxford, Lecturer in Zoology and Comparative 

 Anatomy at St. Mary's Hospital, Paddington 94 



List of Presents 109 



For contim 



Price Two Shillings and Sixpence. 



