xi 



May 14, 1903. 



Professor CAREY FOSTER, Vice-President, in the Chair. 



A list of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following papers were read : — 



I. " On the Discovery of a Species of Trypanosoma in the Cerebro- 

 spinal Fluid of Cases of Sleeping Sickness." By Dr. Aldo 

 Castellant. Communicated by the Malaria Committee of 

 the Royal Society. 



II. " The Combination of Hydrogen and Chlorine under the Influence 



of Light." By P. V. Be van. Communicated by Professor 

 J. J. Thomson, F.R.S. 



III. " On the Photo-Electric Discharge from Metallic Surfaces in 



Different Gases." By Dr. W. Mansergh Varley. Com- 

 municated by Professor J. J. Thomson, F.R.S. 



IY. " The Elasmometer, a New Interferential Form of Elasticity 

 Apparatus." By A. E. Tutton, F.R.S. 



Y. " Meteorological Observations by the Use of Kites off the West 

 Coast of Scotland, 1902." By W. N. Shaw, F.R.S., and 

 W. H. Dines, F.R. Met. Soc. 



VI. "On the Radiation of Helium and Mercury in a Magnetic Field." 

 By Professor Andrew Gray, F.R.S., and Dr. W. Stewart, 

 with R. A. Houstoun and D. B. McQuistan. 



VII. " A New Class of Organo-Tin Compounds containing Halogens." 

 By Professor W. J. Pope, F.R.S., and S. J. Peachey. 



VIII. " The Xanthophyll Group of Yellow Colouring Matters." By 

 C. A. Schunck. Communicated by Ii. T. Brown, F.R.S. 



