lid Linnean Suciefjj of Paris. 



M. Ampere read some new Calculations on the mutual action 

 of two Voltaic conductors. 



M. Brongniart made a Report on M. Prevost's Memoir, 

 in which he establishes the number, the characters, and the or- 

 der of superposition of the different depots which have fol- 

 lowed one another between the primordial and recent formations 

 [terrains] in the environs of Paris, in a great part of Europe, 

 perhaps even in the whole world. The memoir will be printed 

 in the Recueil dcs Savajis Etrangers. 



M. Geoffroy read some observations, by which he endeavours 

 to prove that the Monotreme* are oviparous, and that they ought 

 to form a 5th class in the circle of vertebrated animals. 



I.INXEAN SOCIETY OF PAP.IS. 



June 13. — M. Thollard, of Tarbes, informed the Society, 

 that he had observed a ray of the sun after a shower of rain 

 of a certain duration, falling u})on an ear of r^-e; was sufficient 

 to cause the membrane of the anther inclosing the small vessel 

 containing the pollen, to burst like a pod. This phenomenon 

 may render our information concerning the smut complete. 

 Experiments on this subject should be encouraged. 



M. Persoon gave an account of the work of M. Thore de 

 Dax, on the esculent and the poisonous Fungi of the depart- 

 ment of Landes. He enlarged on the merits of the work, 

 noticed particulai'ly some species which appear to be quite 

 new, and mentioned the treatment which the skiltid physician 

 employs to prevent their poisonous effects. 



Jjdy ^. — M. Vallot, of Dijon, presented a paper on the 

 Sphceria repens, and is of opinion that the sinuous lines ob- 

 servable on the leaves of the rose-bush are not owing to the 

 presence of a parasitic plant, but rather to the ravages of the 

 larva of a species of moth called by him Phalcena tinea rosclla. 



Two memoirs by M. Borghers were read : the first, " An 

 analysis of the means to be employed in making artificial and 

 permanent Meadows in those districts where that important 

 mode of Agriculture is unknown." The other, " Observations 

 on Grafting." 



M. Thiebaut de Berneaud read his " Inquiries concerning 

 the plantsf' known to the ancients by the nan^.e of Cytisns. 

 He therein combats the opinion which would recognise in it 

 the tree medick, the Medicago arhorea ; and proves, by a 

 comjiarison of the words used by old authors with the pro- 

 perties of an Alpine shrub to be met with every where, that 

 the true Cjitism, cried up by Greek and Roman agriculturists, 

 is our common laburnum, Cytisns Laburnum. 



* An order including OiiiiUiorhyndius ; nd Echidna 



XXV. In- 



