Royal Academy of Sciences of Paris* 221 



undergone by the laws of mortality in Europe during the last 

 half century. — M. Deleau read a memoir on the deaf and 

 dumb who have lately recovered their hearing, and on the 

 means of assisting those unfortunate persons. 



Feb. 6. — M. Roziere, attached to the Egyptian commission, 

 communicated a partly inedited work on the physical consti- 

 tution of Egypt, and on its relations with the ancient institu- 

 tions of that country. — M. Paulet communicated a paper on 

 the yellow fever, in competition for the Montyon prize. — M. 

 Theodore Olivier transmitted a memoir entitled Construction 

 of mill-work, in which the axes of two toothed wheels are not 

 situated in the same plane. — Dr. Surun of Limoges commu- 

 nicated a memoir on foetus without heads. — M. G. de St. Hi- 

 laire read a description of the sacred crocodile, called Suchus. 

 — MM. Brongniart, Brochant, Cuvier, and G. de St. Hilaire 

 were appointed to examine a memoir by M. Marcel de Serres 

 on the bones of the mastodon found in Languedoc. — MM. 

 Legendre and Cauchy made a favourable report on M. Fri- 

 zon's memoir relative to the summation of the similar powers 

 of the roots of an equation, and on the theory of repeating 

 fractions. 



Feb. 13. — s M. Bras, principal of the college of Libourne, 

 submitted to the examination of the Academy his demonstra- 

 tion of the postulatum of Euclid, which serves as the founda- 

 tion of the theory of parallels. — M. Andreossy read the first 

 part of a memoir on the depressions of the surface of the globe 

 in the longitudinal direction of chains of mountains, and be- 

 tween two adjacent coasts corresponding in their indentations. 

 — M. Girard read a fourth memoir on canals, considered with 

 respect to their fall and the distribution of locks on them.— 

 M. Cauchy presented a note on the analysis of angular sec- 

 tions. — M. Michael Ostrogradsky transmitted a manuscript 

 containing the demonstration of a proposition of the integral 

 calculus which he applies to some equations, to partial differ- 

 ences of the second order, and to the determination of arbi- 

 trary functions. — M. Dutrochet read a memoir on the egg and 

 the tadpole of the Batrachian reptiles. M. Leroy, of Etiolles, 

 read some researches on asphyxia. — M. Zuglen de Nyevelt 

 communicated a manuscript sketch of a new system of astro- 

 nomy. 



Feb. 20. — MM. Desfontaines and Mirbel made a very fa- 

 vourable report on M. Duvau's memoir on the Veronica. — 

 M. Pinel, jun. read a memoir on the physical causes of mental 

 alienation. — M. Segalas read a paper on the question whether 

 the blood can be the seat of disease ? 



Feb. 27.— M. Girard communicated a second note on the 



theory 



