viii 



Page 



On the Variations of the Diurnal Range of the Magnetic Declination as 

 recorded at the Prague Observatory. By Balfour Stewart, LL.D., 

 F.R.S., Professor of Natural Philosophy at Owens College, Manchester. 389 



List of Presents.... , 402 



No. 188.— May 23, 1878. 



Researches in Spectrum Analysis in connexion with the Spectrum of the 

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



Experimental Results relating to the Rhythmical and Excitatory Motions 

 of the Ventricle of the Heart of the Frog, and of the Electrical Pheno- 

 mena which accompany them. By J. Burdon Sanderson, M.D., LL.D., 

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



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 



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 



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

 Ocean Tides on a yielding Nucleus. By George H. Darwin, M.A., 

 Fellow of Trinity College, Cambridge „ 419 



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 



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 



Extract from Report to Professor Sir "Wyville Thomson, F.R.S., on the 

 Brachiopoda dredged by H.M.S. ' Challenger.' By Thomas Davidson, 

 F.R.S , 428 



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

 Magnetization of Iron, Nickel, and Cobalt. By Sir William Thomson, 

 F.R.S., Professor of Natural Philosophy in the University of Glasgow. 439 



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

 By F. M. Balfour, M.A., Fellow of Trinity College, Cambridge, and 

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



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 



June 6, 1878. 



Annual Meeting for the Election of Fellows ,» 447 



