[65 ] ■ 

 X. Proceedings of Learned Societies. 



ROYAL ACADEiMY OF SCIENCES OF PARIS. 



March 1. — 'T'HE Minister of the Marine transmitted some 

 ■*- specimens of the coal which had sponta- 

 neously taken fire in the arsenal of Brest. He solicited the 

 Academy to investigate the cause of the phenomenon. — 

 M. Paulet presented his manuscript translation of the History 

 of Plants by Theophrastus. — M. Cuvier read a Memoir en- 

 titled " A new Examination of a Fossil Animal from the 

 Schists of Solenhoffer, which appears to belong to the Class 

 of Reptiles, and to which the Name of Plerodactylus has been 

 given." — M. Jomard read a note on the Discoveries recently 

 made in Africa. — M. Becquerel read a Memoir on the Mag- 

 netic Actions produced in all Bodies by the Influence of very 

 powerful electric Currents. — M. Paixhaus gave an account of 

 the experiments lately made at Brest on his new system of 

 artillery. — M. Fresnel, in the name of a Commission, made a 

 Report on an improvement of Saussure's hygrometer proposed 

 by M. Babinet. 



March 8. — M. Bulle, of Besancon, transmitted a manu- 

 script Memoir, entitled Systeme rotatif rayonnant. — M. Bussy 

 described the means he had employed for the liquefaction of 

 sulphurous acid gas. — Mademoiselle S. Germain presented a 

 Memoir, in manuscript, on the Effects which the variable 

 Thickness of sonorous Plates produces on their Vibrations. — 

 M. Pouillot presented an Essay on the Oscillations of the 

 Waters of the Ocean. — M. Poncelet, Captain of Engineers, 



E resented a manuscript work, entitled " On the Centres of 

 armonic Means," supplementary to his Treatise on the pro- 

 jective Properties of Figures. — M. Desfontaines made a very 

 favourable Report on the Memoir of M. Auguste Saint- Hilaire, 

 entitled " A Monograph of the Genera Sauvagesia and Le- 

 vradia." — M. Moreau de Jonnes read some New Researches 

 on the Trigonocephalus fer de lance, or great Viper of the 

 Antilles. — M. Cagniard de la Tour deposited a manuscript 

 Account of his new Researches on Carbonic Acid Gas and the 

 other aeriform Substances which he has obtained in a liquid 

 State. He exhibited several products of his experiments. — 

 M. Dulong, in the name of a Commission, made a Report on 

 the Method of measuring the Power of Bodies to conduct 

 Electricity proposed by M. Rousseau. 



March 15. — M. Payen transmitted an Analysis of Tupi- 



namba Root. — M. Bussy announced that the means by which 



he had succeeded in liquefying sulphurous acid gas, had also 



Vol. 64-. No. 315. My 1824. I enabled 



