vi 



Page 



How do the Colour-blind See the different Colours ? Introductory Re- 

 marks. By Frithiof Holmgren, Professor of Physiology, University, 

 Upsala ,.. 302 



Action of an Intermittent Beam of Radiant Heat upon Gaseous Matter. 

 By John Tyndall, F.R.S 307 



January 20, 1881. 



On Gravimeters, with special reference to the Torsion-Gravimeter de- 

 signed by the late J. Allan Broun, F.R.S. By Major J. Herschel, R.E., 

 F.R.S., Deputy-Superintendent of the Great Trigonometrical Survey of 

 India .... 317 



Experimental Researches into Electric Distribution as manifested by 

 that of the Radicles of Electro]ytes. By Alfred Tribe, F.I.C., Lec- 

 turer on Chemistry in Dulwich College , 320 



On the Tidal Friction of a Planet attended by several Satellites, and on 

 the Evolution of the Solar System. By G. H. Darwin, F.R.S. 322 



On the Female Organs and Placentation of the Racoon {Procyon lotor). 

 By M. "Watson, M.D., Professor of Anatomy, Owens College, Man- 

 chester , 325 



Further Note on the Minute Anatomy of the Thymus. By Herbert 

 Watney, M.A., M.D. Cantab 326 



January 27, 1881. 



The Refraction Equivalents of Carbon, Hydrogen, Oxygen, and Nitrogen 

 in Organic Compounds. By J. H. Gladstone, Ph.D., F.R.S 327 



On certain Definite Integrals. No. 8. By W. H. L. Russell, F.R.S 330 



Polacanthus Foxii, a large undescribed Dinosaur from the Wealden 

 Formation in the Isle of Wight. By J. W. Hulke, F.R.S 336 



On Harmonic Ratios in the Spectra of Gases. By Arthur Schuster, 



Ph.D., F.R.S 337 



Dielectric Capacity of Liquids. By J. Hopkinson, F.R.S 347 



Note on the Occurrence of Ganglion Cells in the Anterior Roots of the 

 Cat's Spinal Nerves. By E. A. Schafer, F.R.S 348 



On the Iron Lines widened in Solar Spots. By J. Norman Lockyer, 

 F.R.S 348 



List of Presents 350 



No. 210.— February 3, 1881. 



Upon the Cause of the Striation of Voluntary Muscular Tissue. By John 

 Berry Haycraft, M.B., B.Sc, F.R.S.E., Senior Physiological Demon- 

 strator in the University of Edinburgh. (Plate 5) 360 



