262 Analytical Notices of Books. 



Vaucher, a species of Conferva, which has within the last twenty years 

 been repeatedly stated, on the authority of very respectable observers, to 

 produce sporte endowed with animal hfe, and capable of reproducing 

 the plant from which they derived their origin. These statements are 

 confirmed, as far as the casual and not very guarded observations here 

 detailed can be regarded as confimatory of so delicate a fact, by the testi- 

 mony of M. Unger, the authour of the present paper; who has seen the 

 animated particles separate from the conioci/sta of the parent plant, 

 perish in the course of a few hours by a conversion into globules of vege- 

 table matter, which sent forth processes and became, after a few days 

 growth. Conferva perfectly similar to the individual from which the 

 supposed animalcula were originally produced. In this new plant he 

 has seen the coniocystcc again form, and the animalcula again separate, 

 the whole cycle of animal and vegetable existence being completed in less 

 than twelve days. Such is the substance of M. Unger's observations: but 

 we repeat that they do not appear to us to have been made with sufficient 

 minuteness, or with that degree of caution which is absolutely necessary 

 to ensure success in so delicate an investigation. At all events we cannot 

 consider this extraordinary fact as by any means clearly ascertained and 

 placed beyond the reach of doubt. 



Histoire NatureUe des JMammiferes: par MM, Geoffroy- 

 Sjint [Jilaire et F. Cuvier. Livraisons, 67eme et 



5Seme. 



Notwithstanding the long delay which has taken place in the ap- 

 pearance of the present numbers of this valuable and important work, 

 their contents afford nothing of high or peculiar interest. Their novel- 

 ties are limited entirely to species, and even these are not advanced with- 

 out the expression of some doubt as to whether the two animals which 

 are so represented may ultimately prove entitled to the rank which has 

 been assigned to them provisionally. The first of these is an Antelope, 

 !to which the appellation of Kevel gris is affixed, and which is closely 



