GEOLOGICAL COLLECTION. 247 



argentiferous lead from the neighbourhood of 

 Vienna, in the department of Isere : the Museum 

 is indebted for them to the viscount Hericart de 

 Thury. 



6th. Some lavae from the department of Ar- 

 deche, given by the late M. Faujas de Saint Fond ; 

 amongst which we distinguish a column of ba- 

 salt, containing in its center a fragment of gra- 

 nite altered by the heat, and various fragments 

 of secondary limestone from Villeneuve de Berg, 

 changed by its contact with a basaltic vein. 



Lastly. A numerous suite of lava, tufae and 

 other rocks, which constitute the departments of 

 Cantal and Puy-de-D6me. The cabinet is in- 

 debted for them to viscount He'ricart de Thury 

 and to M. Lucas, keeper of the galleries of the 

 Museum. 



The second hall contains the rich and nume- 

 rous series of fossil vertebrated animals, and a 

 general and methodical collection of the different 

 formations which compose the mineral crust of 

 the earth. This last collection is arranged in 

 two large chests, 20 feet in length, with drawers 

 on both sides, placed in the middle of the room. 

 We will first examine the fossils of this room, to 

 complete the description we began in the en- 

 trance hall. We shall thus pass in review the 

 whole of the organic remains of the former 



