iv 



No. 191.— December 5, 1878. 



Page 



On the Illumination of Lines of Molecular Pressure, and the Trajectory 

 of Molecules. By William Crookes, F.B.S., VP.C.S 103 



On a Machine for the Solution of Simultaneous Linear Equations. By 

 Sir William Thomson , Ill 



December 12, 1878. 



On the Flow of Water in Uniform Regime in Eivers and other Open 

 Channels. By James Thomson, LL.D., D.Sc, F.B.S., and F.E.S.E., 

 Professor of Civil Engineering and Mechanics in the University of 

 Glasgow 114 



The Magic Mirror of Japan. Part I. By Professors W. E. Ayrton and 

 John Perry, of the Imperial College of Engineering, Japan , 127 



On the Torsional Strain which remains in a Glass Fibre after release from 

 Twisting Stress. By J. Hopkinson, D.Sc, F.E.S 148 



Note in Correction of an Error in the Bev. Dr. Haughton's Paper " Notes 

 on Physical Geology. No. V" ("Proc. Boy. Soc," vol. xxvii, p. 447). 

 By the Eev. Samuel Haughton, M.D., Professor of Geology in the 

 University of Dublin, F.E.S 154 



Measurements of Electrical Constants. No. II. On the Specific Induc- 

 tive Capacities of Certain Dielectrics. Part I, By J. E. H. Gordon, 

 B.A. Camb , 155 



Eesearches in Spectrum Analysis in connexion with the Spectrum of the 

 Sun. No. VII. By J. N. Lockyer, F.E.S 157 



December 19, 1878, 



Note of an Experiment on the Spectrum of the Electric Discharge. By 

 the Horn Sir W. E. Grove, D.C.L., V.P.E.S 181 



On the Precession of a Viscous Spheroid, and on the Eemote History of 

 the Earth. By George H. Darwin, M.A., Fellow of Trinity College, 

 Cambridge 184 



Problems connected with the Tides of a Viscous Spheroid. By G. H, 

 Darwin, M.A., Fellow of Trinity College, Cambridge 194 



On the Influence of Light upon Protoplasm. By Arthur Downes, M.D., 

 and Thomas P. Blunt, M.A. Oxon „ 199 



Note on the Influence exercised by Light on Organic Infusions. By 

 John Tyndall, D.C.L., F.E.S., Professor of Natural Philosophy in the 

 Eoyal Institution 212 



On the Structure and Development of the Skull in the Lacertilia. Part I. 

 On the Skull of the Common Lizards {Lacerta agilis, L. viridis, and 

 Zootoca vivipara). By W. K. Parker, F.E.S 214 



