ProGeedings and List of Papers read. 



423 



DESCEIPTIOX OF PLATE 5. 



Fia. 1. — Photograph, taken by daylight of a cut and polished surface of pitcli- 

 blende. 



Fig. 2. — Radiograph impressed in the dark by the same surface, showing the 

 portions (white) emitting radiant energy. The luminous parts are pitch- 

 blende, the dark parts are felspar, quartz, pyrites, &c. (see para. 5). 



May 31, 1900. 



The LORD LISTER, F.R.C.S., D.C.L., President, in the Chair. 



Dr. Robert Bell (elected 1897) was admitted into the Society. 



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

 ordered for them. 



The President annoimced that the subscription portrait of Sir John 

 Evans, painted by Mr. A. S. Cope, xl.R.A., had been handed over for 

 the acceptance of the Society by the Portrait Committee. 



The following Papers were read : — 



I. " Palaeolithic Man in Africa." By Sir John Evans, K.C.B., r.R.S. 



IL " On the Estimation of the Luminosity of Coloured Surfaces used 

 for Colour Discs." By Sir W. de W. Abney, K.C.B., F.R.S. 



in. " The Sensitiveness of Silver and of some other Metals to Light." 

 By Major-General J. AVaterhouse, I.S.C. Communicated by 

 Sir W. DE W. Abney, K.C.B., F.R.S. 



IV. " The Crystalline Structure of Metals. Second Paper." By Pro- 

 fessor EwiNG, F.R.S., and W. Rosenhain. 



V. " Vapour-density of Bromine at High Temperatures. Supple- 

 mentary Note." By Dr. E. P. Pekman and G. A. S. Atkinson. 

 Communicated by Professor Ramsay, F.R.S. 



Vl. " Influence of the Temperature of Liquid Hydrogen on Bacteria." 

 By Dr. A. Macfadyen and S. Rowland. Communicated by 

 Lord Lister, P.R.S. 



The Society adjourned over the Whitsuntide Recess to Thursday, 

 June 14. 



VOL. LXVI. 



