PROCEEDINGS 



OF 



THE ROYAL SOCIETY* 



December 5, 1889. 



Sir G. GABRIEL STOKES, Bart., President, in the Chair. 



The President announced that he had appointed as Yice-Presi- 

 dents — 



The Treasurer. 

 Professor Alfred Newton. 

 Sir Henry E. Roscoe. 

 Professor A. W. Williamson. 



Professor T. McKe'nnj Hughes was admitted into the Society. 



Pursuant to notice, Professors Stanislao Cannizzaro, Auguste 

 Chauveau, and Henry A. Rowland were balloted for and elected 

 Foreign Members of the Society. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



L u Remarks on Mr. A. W. Ward's Paper - On the Magnetic 

 Rotation of the Plane of Polarisation of Light in donbly 

 refracting Bodies.'" By 0. Wiener and W. Wedding, 

 PhysikaKsch.es Institut, Strassburg i. E. Communicated by 

 Lord Rayleigh, Sec. R.S. Received October 24, 1889. 



In the above-mentioned paper Mr. Ward* communicates theoretical 

 and experimental investigations which, as far as they are correct, are 

 in their essential parts already published, and indeed somewhat more 

 completely in three papers by Gouyf and ourselves, £ the latter inves- 



* Ward, ' Proceedings of the Royal Society,' 1889, vol. 46, p. 65. 



f G-ouy, 'Journal de Physique,' vol. 4, 1885, p. 149, "Sur les Effets shnultanes 

 du Pouroir rotatoire et de la double Refraction." 



+ Wiener, 'Wiedemann's Annalen,' vol. 35, 1888, p. 1. " G-enieinsaine Wirkung 

 von Circularpolarisation and Doppelbrechung, georaetrisch dargestellt." 



Wedding, Hid., p. 25, " Die magnetische Drehung der Polarisationsebene bei 

 "\yachsender Doj)pelbrechung in dilatirteni Glas." 



VOL. XLVII. B 



