272 



• 



Proceedings and List of Papers read. 



June 15, 1899. 



The LOED LISTER, F.E.C.S., D.C.L., President, in the Chair. 



Professor E. W, Brown (elected 1898) was admitted into the Society, 



Professor W. F. Barrett, Dr. Charles Booth, Professor A. C. Haddon, 

 Mr. Richard Threlfall, and Mr. A. E. Tutton were admitted into the 

 Society. 



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

 ordered for them. 



A communication on the Echelon-grating Spectroscope was made by 

 Professor A. A. Michelson, of the University of Chicago. 



The following Papers were read : — 



I. "A Comparison of Platinum and Gas Thermometers, including 

 a Determination of the Boiling Point of Sulphur on the 

 Nitrogen Scale : an Account of Experiments made in the 

 Laboratory of the Bureau International des Poids et 

 Mesures, at Sevres." By Dr. P. Chappuis and Dr. J. A. 

 Harker. Communicated by the Kew Observatory Com- 

 mittee. 



II. " A Preliminary Note on the Morphology and Distribution of 

 the Organism found in the Tsetse Fly Disease." By H. G. 

 Plimmer and J. Rose Bradford, F.R.S. 



III. " The Colour Sensations in Terms of Luminosity." By Captain 



Abney, C.B., R.E., F.R.S. 



IV. " On the Orientation of Greek Temples, being the Results of 



some Observations taken in Greece and Sicily, in May, 

 1898." By F. C. Penrose, F.R.S. 



V. "The Absorption of Rontgen Rays by Aqueous Solutions of 

 Metallic Salts." By Lord Blythswood and E. W. 

 Marchant. Communicated by Lord Kelvin, F.R.S. 



VI. " On the Oxidation of Carbon at ordinary Temperatures by 

 means of Atmospheric Oxygen with the Production of 

 Electrical Energy." By W. E. Case. Communicated by 

 Sir William Preece, F.R.S. 



