PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. xxvn. X No. 188. 



CONTENTS. \\ ^ Ife* 



May 23, 1878. ^^ QEPOSV ^ 



PAGE 



I. Eesearches in Spectrum Analysis in connection with the Spectrum of 



the Sun. No. V. By J. Norman Lockyer, F.R.S 409 



II. Experimental Eesults l'elating to the Ehytlnnical and Excitatory 

 Motions of the Ventricle of the Heart of the Frog, and of the Electri- 

 cal Phenomena which accompany them. By J. Bhrdon Sanderson, 

 M.D., LL.D., F.R.S., and F. J. M. Page, B.Sc., F.C.S. . . .410 



III. Contributions to the Anatomy of the Central Nervous System in Verte- 



brate Animals. Part I. Ichthyopsida. Section 1. Pisces. Subsec- 

 tion 1. Teleostei. By Alfred Sanders, M.R.C.S. . . ■ . . 415 



IV. On the Equations of Circles. (Second Memoir.) By John Casey, 



LL.D., F.R.S., M.R.I.A., Professor of Mathematics in the Catholic 



University of Ireland 417 



Y. On the Bodily Tides of Viscous and Semi-Elastic Spheroids, and on the 

 Ocean Tides on a yielding Nucleus. By G-eorge H. Darwin, M.A., 

 Eellow of Trinity College, Cambridge . . . . . . . 419 



VI. On the Formation of Chlor-iodide and Brom-iodide of Ethylidene. 

 By Dr. Maxwell Simpson, F.R.S., Professor of Chemistry, Queen's 



College, Cork * 424 



VII. Note on the Specific Gravity of the Vapours of the Chlorides of 

 Thallium and Lead. By Henry E. Roscoe, F.R.S., Professor of 

 Chemistry in Owens College, Manchester ...... 426 



VIII. Extract from Report to Professor Sir Wyville Thomson, F.R.S. 



On the JBrachiopoda dredged by H.M.S. "Challenger." By Thomas 



Davidson, F.R.S 428 



IX. Electrodynamic Qualities of Metals. Part VII. Effects of Stress on the 

 Magnetization of Iron, Nickel, and Cobalt. By Sir William Thom- 

 son, F.R.S., Professor of Natural Philosophy in the University of 



Glasgow . . ' 439 



X. On the Existence of a Rudimentary Head-Kidney in the Embryo Chick. 

 Bv F. M. Baleotjr, M.A., Fellow of Trinity College, Cambridge, and 

 Adam Sedgwick, B.A., Scholar of Trinity College, Cambridge . . 443 

 XI. Observations on Arctic Sea-water and Ice. By Surgeon-Major E. L. 



Moss, M.D . .446 



Note to Mr. Sedley Taylor's Experiments on the Colours shown by thin 



liquid Films under the Action of Sonorous Vibrations .... 446 



For continuation of Contents see 4<th page of the Wrapper. 



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