PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



1849. No. 75. 



Dec. 6, 1849. 



GEORGE RENNIE, Esq,, Vice-President, in the Chair. 



The Chairman announced that the Earl of Rosse had nominated 

 as Vice-Presidents : — 



George Rennie, Esq. 

 Sir B. C. Brodie, Bart. 

 Sir Roderick I. Murchisou. 



Professor Owen. 

 Lieut.-CoL Reid, R.E. 

 Peter Mark Roget, M.D. 



The Right Hon. Thomas Babington Macaulay was admitted into 

 the Society. 



Dec. 13, 1849. 



In consequence of the funeral of Her late Majesty the Queen 

 Dowager taking place this day, no Meeting of the Society was 

 held. 



December 20, 1849. 

 Dr. roget, Vice-President, in the Chair. 



A. C. Ramsay, Esq., -was admitted into the Society. 



The Bakerian Lecture was delivered by Professor Graham, F.R.S., 

 " On the Diffusion of Liquids." 



The apparatus used in studying the diffusion of salts and other 

 substances into water was very simple. It consisted of an open 

 phial to contain the solution of the salt to be diffused, which was 

 entirely immersed in a large jar of pure water, so that the solution 

 in the phial communicated freely with the latter. Phials cast in a 

 mould of the capacity of four ounces of water, or more nearly 2000 

 grains, were generally employed, w hich were ground down to a uni- 

 form height of 3*8 inches. The neck w^as 0'5 inch in depth, and the 



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