306 'Royal Academy of Sciences of Paris. 



a memoir on the hernia; of the horse. — M. Costa read a me- 

 moir on the yellow fever of Barcelona. — M. Biissy read a me- 

 moir on the action of heat upon the fatty bodies. 



July 11. — M. Gaetano Giorgini, formerly a student of the 

 Polytechnic School, communicated a memoir on the causes of 

 the insalubrity of the air in the vicinity of sea marshes. — M. Le 

 Jeune d'Yrichlet ti-ansmitted a memoir on the impossibility of 

 some indeterminate equations of the fifth degree. — M. Cagnon, 

 a physician at Vitry-le-Francais, transmitted a memoir, en- 

 titled Some reflections on the means of avoiding the rupture 

 of the rectum, and of stopping the htemorrhages that take 

 place during or soon after the operation for the stone. — M. 

 Arago communicated some new observations on the tempera- 

 ture of artesian springs, which entirely confirm tlie results 

 formerly obtained. The spring of St, Venant maintains 

 throughout the year a temperature of above 57° F., in a coun- 

 try the mean temperature of which certainly does not exceed 

 51°'8 F. This spring rises from the depth of 328 feet. — 

 M. Arago also presented the first table of the meteorological 

 observations which will in future be made at the Tower of 

 Cordouan. — M. Lasserre read, in his own name and that of 

 M. Costat, some explanations of the proposition which he had 

 made at the preceding sitting. In order to prove that the yel- 

 low fever is not contagious, MM. Lassis, Costa, and Lasserre 

 offer to put on the clothes that were worn by persons who have 

 fallen victims to that disorder. — M. Nicollet read a memoir, by 

 himself andj Col. Brousseaud, entitled An exposition of the 

 operations relative to the measure of an arc of mean latitude 

 between the pole and the equator-. — M. Dupuy read his first 

 memoir on the distillation of the fatty bodies. 



July 18. — M. Puissant remarked, by letter, that a portion 

 of MM. Brousseaud's and Nicollet's exposition just mentioned, 

 was founded on his methods and formulae, and that he made a 

 great part of the calculation. — M. Le Gendre, in the name of a 

 committee, made a favourable report on the analytical memoir 

 by M. Le Jeune. — M. Arago communicated the observations 

 on the declination of 61 Cygni, which he had made in con- 

 junction with M. Mathieu. It appears to result from them 

 that the annual parallax of this star, — although it must be re- 

 garded as one of the nearest to the earth, from the rapidity of 

 its proper motion, — does not amount to a single second. — 

 M. Arago also explained in the sequel the grounds of his cer- 

 tainty that the telescope he enijjloyed in his great work, rela- 

 tive to the diameters of the planets, does not give any sensible 

 irradiation. — M. Cuvier made a favourable report on the zo- 

 ological collections brought home by the naturalists attached 



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