Notices respectmg New Books. 133 



tion, as far as relates to motion in elastic mediums, I have 

 considered in the paper above referred to. 

 Trin. Coll., April 13th. J. Challis. 



XXI. Notices respecting New Books. 



M. Adolphe Brongniart's History of Fossil Vegetables. 



THE second livraison of this most interesting and beautiful work 

 has recently appeared, and contains figures and descriptions 

 of upv/ards of thirty species of fossil plants, of the genera Fucoides, 

 Conjerviles, Muscites, Equiseium, Catamites, &c. We regret to learn 

 that from the death of the publisher, the completion of the work will 

 experience some delay ; but the learned and indefatigable author 

 has just published a " Prodrome de I'histoire des vegetaux Jbssiles" 

 which is intended as a compendium of the whole work ; but it is 

 without plates, or descriptions of species. This little publication is 

 highly interesting; for it contains the author's views of the deve- 

 lopment of vegetation, and the characters thereby furnished to 

 distinguish the different formations. From the increased and in-t 

 creasing taste for geology, we hope both the works now mentioned 

 will meet with due encouragement from the literati of this country. 

 We subjoin M. Brongniart's list of the plants which characterize the 

 secondary and tertiary formations, extracted from the " Prodrome " 

 alluded to. 



PLANTES CARACTERISTIQUES DES DIVERSES FORMATIONS. 



Terrain houilleb. Coal Measures. 



Calamites. 

 Filices des genres Sphenopteris, Neuropteris, Pecopteris, et *Odon- 



topteris especes tres nombreuses. 

 Lycopodites et *Lepidodendron. *Sphenophyllum, *AnnuIaria, 



et *Asterophyllites. Les quatres derniers genres ne se 



trouvent que dans ces terrains. 



Zechstein et Schistes bitumineux. 

 Algae analogues a des Caulerpa, particulierement * Fucoides sela- 

 ginoides. 



Gre's bizarre. 

 Calamites. 



Filices des genres Sphenopteris, Neuropteris, et *Anomopteri8. 

 Coniferes du genre *Voltzia. 

 Plusieurs plantes phancrogamcs monocotylcdones. 



Muschelkalk. 

 Neuropteris Gaillardati. 

 Mantcilia cylindrica. 



Maunes iuise'es. Keuper it Lias. 



*Equisetum columiiare. 

 Filices des genres ♦Clatliroptcris, Tcnioptcris. Cycadcae des genres 



*l'teropliylluni, *Nilsonia et Zamites; particuhiremL-Dt Ic 



•IHeruphyllum longifolium ct Ics Zamites liuchii ct IJuck- 



landii. 



