1912] General Monthly Meeting. 427 



GENERAL MONTHLY MEETING, 



Monday, April 1, 1912. 



His Grace Tjie Duke of Northumberland, K.G. D.C.L. F.R.S,, 

 President, in the Chair. 



Frank Cyril Tiarks, Esq. 

 Mrs. Tiarks, 

 Alfred Wagg, Esq. 



were elected Members of the Royal Institution. 



The Special Thanks of the Members were returned to Mrs. Ludwig 

 Mond and family for their Gift of a large Bronze Medalhon of the 

 late Dr. Ludwig Mond, F.R.S., the founder of the Davy Faraday 

 Laboratory. 



The Honorary Secretary announced the decease of Professor Petr 

 Nikola jewitsch Lebedew, on March 14, 1912, and the following 

 Resolution passed by the Managers at their Meeting held this day 

 was unanimously adopted : — 



Resolved, That the Managers of the Royal Institution desire to record their 

 sense of the loss sustained by the Institution and the Scientific world in the 

 decease of Professor Petr Nikolajewitsch Lebedew, Ph.D. (Strasburg), Professor 

 of Physics in the University of Moscow, and an Honorary Member of the Royal 

 Institution since 1910. 



He made numerous valuable contributions to our knowledge of physical 

 problems. Twenty-seven years after Clerk Maxwell had put forward his theory 

 of light pressure, Professor Lebedew described before the Congres International 

 de Physique in Paris in 1900 an experiment in which he had detected this pres- 

 sure by directing the beam from an arc lamp on to platinum discs suspended 

 in a very high vacuum, and found a value in accordance with Maxwell's theory. 

 He also conducted important investigations on Electro-Magnetism and Hydro- 

 dynamics. 



The Managers desire to oiier, on behalf of the Members of the Royal Insti- 

 tution, the expression of their most sincere sympathy with the family in their 

 bereavement. 



The Presents received since the last Meeting were laid on the 

 table, and the thanks of the Members returned for the same, viz. : — 



FROM 



The Secretary of State for Iwdia— Catalogue of the Imperial Library, Calcutta, 



Part II. 8vo. 1910. 

 British Museum, The Trustees — Catalogue of Greek and Roman Jewellery. 



4to. 1911. 

 Catalogue of German Woodcuts, Vol. II. 8vo. 1911. 



