1818.] Royal Academy of Sciences. 225 



read. The substance in question was found adhering to the 

 sides of a lead mine in the mountain of Esqueme, one of the 

 Pyrenees ; externally, it is white, opaque, and adheres to the 

 tongue ; internally, it is translucent, and of a yellowish green 

 colour ; it yields readily to the knife ; and, from an analysis by 

 M. Berthier, appears to be' composed of 



Alumina 44-5 



Water 40-5 



Silex : 15-0 



100- 



A memoir, by M. Magendie, on prussic acid, was read. 



Nov. 24. — A memoir, by M. Fresnel, was read, on the modifi- 

 cations produced on light by reflection. 



M. Dupetit-Thouars read a memoir on the growth of bulbous, 

 roots. 



The class of zoology and anatomy presented the following list 

 of candidates, to fill up the place of corresponding member, 

 vacant by the appointment of M. Scarpa to the place of Asso- 

 ciate, viz. Schneider, Rudolfi, Lamoroux, Dutrochet, Poli, Rizzo, 

 Kilby (qu. Kirby), Schreiber, Schweigher, Marcel de Serres, Noel 

 de Lamoriniere, and Prevot. 



The class of geometry presented the following list, from which 

 to supply the place vacant by the death of M. Jenty ; viz. Kramp, 

 Ivory, Plana, and Gergone. 



Dec. 1. — M. Fevre presented the third part of his manuscript 

 chemical tables ; and M. Doderet, a memoir on several points of 

 astronomy ; both of which were referred to committees. 



M. Fourier read a report on the memoir of M.Despretz, on the 

 distribution of heat through solid bodies. 



The Academy resolved, that the above memoir should be 

 printed in the next volume ofSavam et rangers. 



Ballots took place in order to fill up the vacancies mentioned 

 Nov. 24, when M. Lamoroux was chosen in the class of zoology, 

 <md M. Kramp in that of geometry. 



Dec. 7. — A memoir, by M. Borguis, was read, on the Belter 

 moteur, which was referred to a committee. 



A paper, by M. Adam, on arithmetic, was also referred to a 

 committee. 



M. Ivart delivered in a report on Sir J. Sinclair's code of 

 agriculture. 



The class of botany presented the following list of candidates 

 fur the vacant place of corresponding member ; viz. Smith, 

 Kunth, Aug. Saint-Hilaire, Scheygrichon, Desvaux, Persoon, 

 Acharius, Bonpland, Dumas, and Nestler. 



Dec. 15. — A letter, by M. Frey, was read, enclosing a memoir 

 on the origin of organized and inorganized bodies : the whole 

 was referred to a committee. 



Vol. XI.y°ITJ. V 



