PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. xxxvilt.. r V\ No. 237. 



CONTENTS. 



April 16, 1885. 



I. Note on an Experiment by Chladni. By Charles Tomlinson, F.R.S 

 •-. r (Plate 1) . . ... .... 



II. On the General Characters of the Genus CymbuUa. By John D 

 Macdonald, M.D., F.R.S , Inspector- General R.N. . 



PAGE 



247 

 251 



III. On the Agency of Water in Volcanic Eruptions ; with some Observa- 

 tions 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, F.R.S. , Professor of Geology in the University of 

 Oxford V . . . ... . . . 253 



IV. On the Fibrin-yielding Constituents of the Blood Plasma. By L. C. 

 Wooldridge, M.B., D.Sc., Demonstrator of Physiology in Guy's 

 Hospital. From the Laboratory of the Brown Institution . . 260 



April 23, 1885. 



I. Magnetisation of Iron. By John Hopkinson, M.A., D.Sc., F.R.S. . 265 



II. On the Changes produced by Magnetisation in the Length of Rods of 



Iron. Steel, and Nickel. By Shelford Bidwell, M.A., LL.B. . 265 



III. The Essential Nature of the Colouring of Phytophagous Larvae (and 

 their Pupa?) ; with an Account of some Experiments upon the Rela- 

 tion between the Colour of such Larvae and that of their Food-plants. 

 By Edward B. Poulton, M.A., of Jesus and Keble Colleges, Oxford 269 



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