On certain Ternary Alloys. Part IV. On a Method of Graphical 

 Representation (suggested by Sir G. G. Stokes) of the way in which 

 certain Fused Mixtures of Three Metals divide themselves into 

 Two different Ternary Alloys ; with further Experiments suggested 

 thereby. By C. R. Alder Wright, D.Sc., F.R.S., Lecturer on Che- 

 mistry and Physics in St. Mary's Hospital Medical School ; C. 

 Thompson, F.I.C., F.C.S. ; and J. T. Leon, B.Sc., F.C.S., Assistant 

 Lecturer on Physics and Demonstrator of Chemistry in St. Mary's 

 Hospital Medical School , 174 



On the Structure of Amreboid Protoplasm, with a Comparison between 

 the Nature of the Contractile Process in Amoeboid Cells and in Mus- 

 cular Tissue, and a Suggestion regarding the Mechanism of Ciliary 

 Action. By E. A. Schafer, F.E.S 193 



On the Demonstration by Staining of the Pathogenic Fungus of Malaria, 

 its Artificial Cultivation, and the Results of Inoculation of the same. 

 By Surgeon J. Fenton -Evans, M.B 199 



List of Presents..., . 200 



February 19, 1891. 



On the Sensitiveness of the Bridge Method in its Application to Periodic 

 Electric Currents. By Lord Rayleigh, Sec. R.S 203 



On the Influence of Pressure on the Spectra of Flames. By G. D. Liveing, 

 M.A., F.R.S., Professor of Chemistry, and J. Dewar, M.A., F.R.S., 

 Jacksonian Professor, University of Cambridge 217 



On the Focometry of Lenses and Lens-Combinations, and on a new Foco- 

 meter. By Silvanus P. Thompson, D.Sc., B.A., Professor of Physics 

 in the City and Guilds Technical College, >Finsbury 225 



The Numerical Registration of Colour. Preliminary Note. By Captain 

 W. de W. Abney, C.B., R.E., D.C.L., F.R.S 227 



List of Presents.... .. 233 



February 26, 1891, 



CROONIAN LECTURE. On the Mammalian Nervous System ; its Functions 

 and their Localisation determined by an Electrical Method, By .Francis 

 Gotch, Hon. M.A., Oxford, and Victor Horsley, B.S., F.R.S., &c. 

 (From the Physiological Laboratory, Oxford) 235 



List of Presents .. 24C 



The Rupture of Steel by 'Longitudinal Stress. By Chavles A. Carus- 

 Wilson. (Plates 2 and 3) 243 



Photometric Observations of the Sun and Sky. By William Brennand.... 255 



No. 299. 



On the Minute Structure of the Muscle-Columns or Sarcostyles which 

 form the Wing-Muscles of Insects. Preliminary Note. By E. A. 

 Schafer, F.R.S. (Plates 4 and 5) 280 



