Royal Academy of Sciences of Paris. 57 



A letter from M. Virey On the spontaneous rise of the spider's web 

 in the air j— M Navier read a memoir On the flow of elastic fluids 

 in vessels and pipes ; — M. Strauss read an extract from his work On 

 the Anatomy of the Spider. 



Junes. — Manuscripts: — A sealed packet from M. Segalas ; — A 

 treatise On the employment of atmospheric air in diseases of the 

 ear, by M, Deleau ;— A memoir On a new method of finding the 

 longitude, by M. Devoulx ;— Two new demonstrations of the reality 

 of the roots of transcendental equations, led to by several mathema- 

 tico-physical questions; —A sealed packet by M. Cauchy ; — A memoir 

 On refractory crucibles, by M. Boyer, manufacturer of porcelain ; — 

 A memoir by M. Marcel de Serres, On a cavern of fossil bones in 

 the Department of the Eastern Pyrenees. — M. Latreille, in the name 

 of a Commission, made a very favourable report respecting the Mo- 

 nographe des crustaces ampliipodes, by Mr. IMilne Edwards. 



M. Arago announced the irreparable loss which the Academy had 

 sustained in the person of Sir H. Davy. 



June 22. — Manuscripln.—A letter to Ariste On the theory of celes- 

 tial crosses in general, and on the cross of Migne in particular, by 

 M. Clos ; — Designs executed by M. Sainson during the voyage of M. 

 d'Urville ; — Description of the apparatus belonging to moveable 

 lighthouses, by M. Castera ; — A letter in which M. Datrochet an- 

 nounces that lie has discovered that a capillary column of water con- 

 ducts electricity very badly. — The Academy learnt with grief the death 

 of Dr. Thomas Young, one of the most illustrious of its members ; 

 and also that of M. Abel, a young geometer of Christiania of the 

 greatest hopes. 



M. Magendie announced that M. Leroux, an apothecary, had dis- 

 covered in tlie willow two substances analogous toquina and cincho- 

 nia.— M. Navier, in the name of a Commission, gave a very favour- 

 able account of the new work of M. Coriolis, On the calculus of ma- 

 chines. — M. Cauchy, in the name of a Commission, reported respecting 

 a manuscript treatise On the differential calculus, presented by M. 

 Finck.— M. Elie de Beaumont read a memoir entitled. Researches on 

 some of the revolutions of the surface of the globe ; &c. &c. 



June 29.— A memoir by M. Lionville On the analytical theory of 

 lieat;— Observations on the Mulhm-ce, by M. Audouin;— Memoir by 

 M. Cristol, On the caverns of fo.ssil bones lately discovered in the 

 South ;— A new method of destroying the stone in the bladder, by 

 M. Iligaud dc Jemign6;— A memoir on the same .subject, by M. 

 Dudon. The Academy afterwards heard a notice by M. H(5ricart de 

 Thury, On a new well bored at Saint Ouen, by MM. Flachat j— 

 Some remarks by M. Gay Lussac, in answer to the doubts expressed 

 by the mayor of Carantau, On the placing of a conductor on ^the 

 steeple of that city ; — Some considerations by M. Du Petit-Thouars 

 On the Orchidea? of the Isle of France ;— A rejiort by M. Cauchy, On 

 a memoir by M Abel, of Christiania, respecting a general property 

 of a very extensive class of transcendental functions ; — .\nd, lastly, 

 A memoir by M. Lugol, On the employment of iodine in .scrofula. 

 N. S. Vol. 7. No. ?.7. Jan. 18,30. 1 X. Intel- 



