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PROCEEDINGS OP THE BRITISH ASSOCIATION 

 AT BRISTOL IN AUGUST 1836.* 



GENERAL OFFICERS. 



President. — The Marquis of Lansdown ; but owing to his unavoidable 

 absence, his place was taken by the Marquis of Northampton. 



Vice-Presidents. — Rev. W. D. Conybbare, F.R.S. — James C. Prichard, 

 M.D. F.R.S. 



General Secretaries. — Rev. William V. Harcourt, F.R.S. — Francis 

 Bailly, F.R.S. 



Assistant General Secretary. — Professor Phillips of King's College. 



Treasurer.— J oYi^ Taylor, Esq. F.R.S., F.G.S. 



LOCAL OFFICERS. 



Treasurer. — George Bengough, Esq. 



Secretaries. — Professor Daubeny. — V. F. Hovenden, Esq. 



Section A Mathematical and Physical Science. 



President. — Rev. W. Whewell, F.R.S. 



Vice-Presidents Sir D. Brewster. — Sir W. R. Hamilton. 



Secretaries. — Professor Forbes. — W. S. Harris, Esq. F.R.S — 

 F. W. Jerrard, Esq. 



The following Memoirs were read, and statements made, and 

 more or less extensively discussed: — 1. Notice regarding the pro- 

 gress made in the construction of a Lens of Rock-salt, by Sir D. 

 Brewster. 2. Account of the recent Tide Observations made at 

 the ports of London and Liverpool, by Mr Lubbock. Mr Lub- 

 bock stated. That through the indefatigable exertions of Mr Des- 

 siou, considerable progress had been made in the reduction of the 

 observations made at Liverpool by Mr Hutchinson. The diurnal 

 inequality or difference between the superior and inferior tide of 

 the same day, which in the Thames was very inconsiderable, if not 

 insensible, was found at Liverpool to amount to more than a foot ; 

 a matter upon which the learned gentleman laid considerable stress, 

 as calculated to lead to important practical results. The object of 

 these reductions was to compare the results of theory with these 

 observations, and with those of Mr Jones and Mr Russell made at 

 the port of London: The principal objects of comparison were the 

 heights of the several tides, and the intervals between tide and tide ; 

 and these were examined in their relations to the parallax and de- 



* Report prepared from accounts in Athenaeum, Felix Farley's Bristol 

 Journal, and private communications. 



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