Meteorological Society. 229 



M. Ampere presented to the Academy an Instrument for 

 Measuring the Intensity of the Electro-dynamic force, in de- 

 termining by experiment the duration of the oscillations which 

 are produced, at various distances, in a circular moveable con- 

 ductor, by the action of two sen^i-circumferences forming part 

 of a Voltaic circuit. 



Mr. Walsh had addressed to the Academy a fresh note on 

 vv'hat he formerly denominated the hinominal calculus, and 

 which he now wished to call the Irish calculus [calctil (Tlr- 

 lande), Mr. Walsh's country. The report now read by M. 

 Cauchy on this subject was not moi'e favourable than his re- 

 ports on the preceding memoirs of the same author. M. 

 Lassaigne read his Observations on the Existence of Cystic 

 Oxide in a vesical Calculus from a Dog, and an analytical 

 Essay on its elementary Composition. 



June 23. — M. de Humboldt gave a detailed account of the 

 new work on the last Eruption of Vesuvius, published by 

 MM. Monticelli and Covelli * ; and he communicated the re- 

 sults of the measurements which he made shortly after that 

 event. 



M. de Freycinet communicated a letter written by M. 

 Duperrey, and dated from La Conception, in Chili, the S^th 

 of January last. M. Duperrey announces the transmission of 

 the Magnetic Observations, and of those on the Pendulum, 

 which he made at the various places at which he touched 

 during his voyage. 



XLVIII. Intellige?ice and Miscellaneous Articles. 



PROPOSED ESTABLISHMENT OF A METEOROLOGICAL SOCIETY. 



nPHE science of Meteorology, we understand, is likely to re- 

 -^ ceive, in a short time, the powerful aid of a Society expressly 

 devoted to its cultivation. A meeting will be held on the third 

 Wednesday in October, at the London Coffee-house, Ludgate 

 Hill, at 8 o'clock in the evening, for the purpose of taking the 

 subject into consideration, at which a number of scientific gen- 

 tlemen, attached to the science, are expected to attend : and 

 we hope their example will be followed by all who are inter- 

 ested in Meteorological pursuits. 



MISSION TO THE INTERIOR OF AFRICA, FOR THE DISCOVERY 

 OF THE COURSE OF THE RIVER NIGER. 



We have the greatest satisfaction in announcing that our 



* Seepage 90 of our present volume. 



three 



