312 



The votes of the Fellows present having been collected, the fol- 

 lowing Gentlemen were declared duly elected : — 



James Apjohn, M.D. 

 John George Appold, Esq. 

 John Allan Broun, Esq. 

 Antoine Jean Francois Claudet, 

 Esq. 



Edward J. Cooper, Esq. 

 E. Frankland, Esq. 

 John Hall Gladstone, Esq. 

 Commander Inglefield, R.N. 



Joseph Beete Jukes, Esq. 

 Robert MacAndrew, Esq. 

 Charles Manby, Esq. 

 Joseph Prestwich, Esq. 

 William J ohn Macquorn Rankine, 

 Esq. 



William Wilson Saunders, Esq. 

 William Spottiswoode, Esq. 

 Count P. de Strzelecki. 



The Society then adjourned; 



June 9, 1853. 

 The EARL OF ROSSE, President, in the Chair. 



The following Gentlemen were 



John George Appold, Esq. 

 Antoine Francois Jean Claudet, 

 Esq. 



Edward Frankland, Esq., Ph.D. 



admitted into the Society : — 



John Hall Gladstone, Esq., Ph.D. 

 Robert MacAndrew, Esq. 

 Charles Manby, Esq. 

 Count Strzelecki. 



The following papers were read :— 



1. " Further Experiments and Observations on the Properties of 

 Light." By Lord Brougham, F.R.S., Member of the Institute of 

 France. Received May 9, 1853. 



1 . The author considers that Sir Isaac Newton's experiments to 

 prove that the fringes formed by inflexion and bordering the sha- 

 dows of all bodies, are of different breadths when formed by the 

 homogeneous rays of different kinds, are the foundation of his theory, 

 and would be perfectly conclusive if the different rays were equally 

 bent out of their course by inflexion, for in that case the line joining 

 the centres of the fringes on opposite sides of the shadow being, as 

 he found them, of different lengths, the fringes must be of different 

 breadths. He found that line to be -3^^ inch in the red, -^-^ in the 

 violet of the nearest fringe ; in the red, g-^y in the violet of the 

 second fringe ; and these proportions he found to be the same at all 

 distances of the chart from the hair. But if the rays are of diflferent 

 flexibility, if the red, for example, is bent to a greater distance from 

 its course than the violet, the experiment becomes wholly inconclu- 

 sive ; and the line joining the centres may be greater in the red than 

 in the violet, although the breadths of the two fringes are equal, 

 or even though the violet fringe may be broader than the red. 



2. A variety of experiments are adduced in the paper to show that 

 this property of different flexibility exists, which Sir I. Newton had 



