XXXll FOURTH REPORT — 1834. 



M. Arago expressed his readiness to comply with the request 

 of the Committee as soon as it should become practicable j 

 and stated that the immense collection referred to (amounting to 

 more than 100,000 careful observations, and relating to nearly 

 all parts of magnetical science,) had been some time since des- 

 tined for publication, but that the printing of them had been post- 

 poned in consequence of an application which had come from 

 England for the cooperation of France in furnishing data for the 

 improvement of the theory of the tides. When Mr. Lubbock ap- 

 plied to the Bureau des Longitudes, through M. Poisson, for tlie 

 loan of the manuscript observations on the tides at Brest, it was 

 decided, at the earnest recommendation of M. Arago, that an 

 object in which other nations were thus taking interest should 

 have the preference given to it; that the observations on the 

 tides at Brest should be printed at the expense of the French 

 Government, and that copies shovUd be furnished to those per- 

 sons in foreign countries who were ready to use them. 



The Committee then proceeded to receive and revise the re- 

 commendations laid before them by the Committees of Science. 



COMMITTEES OF SCIENCE. 



The several Committees met daily at 10 a.m., to arrange the 

 business of the Sections and to determine on the recommenda- 

 tions which were to be presented to the Committee appointed 

 to receive them. 



Committee for Mathematical and Physical Science. 



The Committee reported on the part of the Sub-Committee for 

 discussing observations on the tides (see vol. ii. p. 471-), that 

 the discussion of the tide observations, and the formation of 

 tide tables, was in considerable progress, and woidd be conti- 

 nued with all practicable expedition. That the sum of 50/. only, 

 out of the 200/. appropriated by the British Association for this 

 purpose, had at present been paid by the Treasurer ; but that it 

 was probable that the whole of the sum so appropriated might 

 be eventually required. 



The gentlemen of the AtheniBum of Liverpool, on being ap- 

 plied to on the part of the British Association, with great libe- 

 rality and kindness sent the original manuscript of Mr. Hutch- 

 inson's observations to Mr. Dessiou of the Admiralty, who was 

 engaged by the Sub-Committee to discuss them. These observa- 

 tions are now undergoing the requsite calculations. 



