GENEVA SOCIETY OF PHYSICS AND NATURAL HISTORY. 213 



obtained from the restoration of the growth of trees to the Island of 

 Ascension, from an article by Mr. Bell, inserted in the Gardener's Chron- 

 icle. 



M. Micheli presented a branch of the genus Ficus repens bearing fruit, 

 which is remarkable from an extraordinary transformation of the leaves. 

 The same member gave some details of the flora of the central and north- 

 ern country of the Argentine Eepublic, from collections made by M. Lo- 

 renz, and described by M. Griesebad. 



M. Ph. Plantamour invited the members of the society, or those whom 

 it might interest, to his residence, to see two plants of Arm(ypliopfales 

 Bivieri, jast ready to bloom. 



M. A. Humbert pointed out a peculiar change in the lenses of the micro- 

 scope, which he attributed to algse attached to the glass, and produced 

 by humidity. The same member described a work by M. Gerstaecker 

 on the respiratory organs of certain insects, and of a memoir of M. Zel- 

 ler on the development of the larvae of intestinal worms. 



Dr. Lombard made a communication relative to the accidents in the 

 last ascension of the balloon, the Zenith. He dwelt upon the conse- 

 quences of the diminution of the quantity of oxygen contained in a litre 

 of air at a great height, and on the internal and external i5erij)heric 

 motions produced by a too rapid ascension. 



Dr. Provost presented a resumS of the researches recently made on 

 apomorphine, and the effect produced by this substance on different 

 animals. The same member summed up the most recent observations 

 on the hypnotic action of hydrate of chloral, the use of which may be re- 

 garded as dangerous to man, but which is capable of rendering great 

 service in experiments by vivisection of animals. 



