Royal Academy of Sciences of Paris. 305 



had already been subjected to treatment : M. Maisonabe will pre- 

 sent him again when cured. — M. Arago, in the name of a Com- 

 mission, reported on M. Bunten's modification of the barometer. — 

 Mi Beudant continued the reading of his paper On the analyses of 

 minerals. — M. Heron de Villefosse communicated the results of 

 statistical researches on iron. 



April 21 The Academy received : Considerations on light and 



colours, by Baron Blein ; — a memoir by M. J. Cambessedes, On 

 the families of the Ternstromiacece and Guttiferce; — a memoir by 

 M. Warden, On the civilization of the Cherokees ; — Researches on 

 the harvests of France formerly and at present, by M. Benoiston de 

 Chfiteauneuf. — MM. Arago and Savart announced that the me- 

 moir of M. Braun On the means of directing air-balloons, contained 

 nothing worthy of serious criticism. — M. Poisson read a memoir 

 On the equilibrium and motion of elastic bodies. — M. Latreille gave 

 a very favourable account of M. Guerin's memoir On a new genus 

 of Crustacea, called Euripode. 



April 28. — The reading of the minutes of the last sitting occa- 

 sioned various explanations between MM. Poisson, Navier, and 

 Cauchy, on the subject of differential equations proper to represent 

 the internal motions of elastic bodies. — The Academy received 

 A claim from M. Meller on the subject of M. Maisonabe's com- 

 munication respecting the cure of club feet ; — A sealed packet from 

 M. Deleau, marked : Theory of stammering ; — A letter from M. 

 Despretz, relating to some fusible white crystals, volatile at a low 

 temperature, which he had noticed during the decomposition of bi- 

 carburetted hydrogen subjected to a strong heat ; and on the dimi- 

 nished density of iron, copper and platina, during the decomposition 

 of ammonia by these metals. After the reading of this letter, M. 

 Savart stated that he had himself long since found, in concert with 

 M. Persoz, the last results obtained by M. Despretz. Several mem- 

 bers of the Academy present at the sitting, asserted that M. Savart 

 had mentioned it to them. — M. Delpech communicated several facts 

 relating to rhinoplasty, to the disease known by the name oftrichyasis, 

 &c. &c. — Baron Blein read the memoir on light and colours, which 

 he presented at the last sitting. — M. Warden communicated some 

 information respecting the American colony established at Liberia, 

 on the coast of Africa. — A Commission was appointed to propose 

 a mathematical prize for 1830 ; it was composed of MM. Legen- 

 dre, Fourier, Poisson, Lacroix, and Poinsot. — M. Longchamp read 

 an additional notice on his theory of nitrification. A member, M. 

 Arago, observed that M. Longchamp's memoir contained state- 

 ments totally devoid of science ; that he imagined he had even 

 heard offensive personalities against a very distinguished foreign 

 philosopher. He invited the President to listen attentively to the 

 remainder of the memoir, and to decide, whether he ought not to 

 stop the reading of it, in conformity with an article of the regula- 

 tions. 



Prizes adjudged "by the Royal Academy of Sciences for the year 1828. 



On examining the essays, it was found that no one of them suf- 



New Scries. Vol. 4-. No. 22. Oct. 1828. 2 R ficiently 



