60 Roi/al Acadfrny of Sciences of' Paris. 



in agriculture. — M. Chevreul read a memoir relative to the 

 simultaneous action of oxygen gas and of alkalies on a great 

 number of organic substances. 



Auo-. 30. — Mr. Walsh, of Cork, communicated a note on 

 the line of the most rapid descent. — M. Fresnel made a re- 

 port, in the name of a commission, on the new microscopes 

 of M. Selligue. — M. Payen read a memoir on the pyrites 

 found on the 19th of August 1824, in a gravel-pit at Gre- 

 nelle, and on the power which several mineral substances pos- 

 sess of depriving vegetable bodies of their colour. — M. Runge 

 read a memoir on the chemical characters of the plants which 

 constitute the families of the Dipsacece and Rubiacece. 



Sept. 6. — M. de Freycinet commmiicated an extract of a 

 letter, dated Amboyna, Oct. 14, 1823, which he had received 

 from M. Duperrey, commander of the discovery ship La 

 Coquille. It contained some interesting details of the re- 

 searches in geography and natural philosophy made in this 

 expedition, as well as of the collections which have been 

 formed. — M. Moreau de Jonnes comnuuiicated some parti- 

 culars of the yellow fever which appeared in the Island of 

 Ascension in 1823. — M. Bouvard stated the parabolic ele- 

 ments of the comet discovered at La Marlia and at Marseilles 

 in July 1824 ; calculated from observations made at the Royal 

 Observatory from August 3 to Sept. 3. — M, Desfontaines 

 gave a verbal report on a work, entitled Hurtiis Ripulensis, 

 scu Enumeratio Plantarum qtice Ripnlis coluntur ab Aloysio 

 CoLLA. — M. Thenard presented, in a verbal report, the re- 

 sults of the analysis which he had made, in conjunction with 

 !M. Vauquelin, of several fragments of the fossil found at 

 Moret ; and M. Cuvier, in relation to the same subject, made 

 some remarks on the characters which belong to the organic 

 remains of animals. — M. Navier made a verbal report on Mr. 

 Stevenson's History of the Northern Lighthouses. — M. Geof- 

 froy de Saint-Hilaire read a memoir, entitled On the com- 

 position of the skull in vertebrated animals, principally of 

 crocodiles and birds: (art. 1.), of the Cranium, as forming 

 part of the rachis, and as consisting of seven veriebrcc. 



[On Sept. 13 no meeting was held, on account of the ill- 

 ness of His Majesty Louis XVIII.] 



Sept. 20. — M. Martillat announced some new improvements 

 in his steam-engine. — A letter from Mr. Walsh was sub- 

 mitted to the examination of M. Cauchy. — M. Gaudin, of 

 Nantes, communicated a memoir on equations of the 2d order. 

 — M. Latieille made a verbal report on the Analecta Entomo- 

 logicu of M. Dalmane. — M. Fourier read a memoir, entitled 

 General remarks on the temperatures of the terrestrial globe 



and 



