258 



Annuaire de rAcademie Royale des Sciences et Belles Lettres do 

 Bruxelles, pour 1839. 



Bulletin de rAcademie Royale des Sciences et Belles Lettres de 

 Bruxelles. 1838. Nos. 9, 10, 11, 12. 



Nouveaux Memoires de 1' Academic Royale des Sciences et Belles 

 Lettres de Bruxelles. Tome xi. 



Memoires Couronnes par I'Academie Royale des Sciences et Belles 

 Lettres de Bruxelles. Tome xiv. Premiere partie. 



By the Academy. 



Annuaire de I'Observatoire de Bruxelles pour I'an 1839, par le Di- 

 recteur A, Quetelet. — By the Atithor. 



Resume des Observations Meteorologiques faites en 1 838 a I'Obser- 

 vatoire de Bruxelles, par A. Quetelet, Directeur de cet Eta- 

 blissement. — By the Author. 



Journal of the Asiatic Society of Bengal for August 1838 — By 

 the Society. 



Astronomical Observations made at the Royal Observatory, Edin- 

 burgh. By Thomas Her.derson, F. R. S. E. and R. A. S. 

 Vol. ii. for the year 1836. — By the Boyal Society of London. 



Journal of the Royal Geographical Society. Yo\. ix. Part 1 — 

 By the Society. 



Geometrical Theorems and Analytical Formulae, with their appli- 

 cation to the Solution of certain Geodetical Problems. By 

 William Wallace, LL.D., &c By the Author. 



The following communications were read : — 



1 . On the Theory of the Motion of Waves. By Professor 

 Kelland. 



The author proposes, in a series of memoirs on this subject, to 

 investigate the different problems of Hydrodynamics, in a manner 

 which shall carry theory along with experiment. From the great 

 attention that has been of late years bestowed on the question of tiie 

 motion of the tide-wave, any mathematical investigation which does 

 not assume some process of approximation, is extremely interest- 

 ing. Whilst the more recondite problems of motion derived from 

 impulses, &c. have been carefully examined by the greatest philo- 

 sophers of the present day, the more simple and easy ones have been 

 left almost untouched. This maybe accounted for by the elegance 

 of the process in the former case compared with that to be pur- 



