

GEOLOGICAL COLLECTION. 265 



nate the collection. We remark first, the rounded 

 silex, sand, mud and fossil remains of the great 

 diluvian formation. 2d. The different alluvial 

 productions which are daily created by the sea, 

 rivers, torrents and springs. 3d. The organic 

 detritus, which are mingled or alternated \vith 

 these productions, such as peat, and conglome- 

 rated shells or madrepores belonging to animals 

 whose species are now living, /^ih. The various 

 substances proceeding from volcanoes either 

 now burning, or extinguished since the last 

 diluvian catastrophe gave the continents their 

 present outline. "We observe with some in- 

 terest among the lavas of this last epoch a slab 

 of scoria from mount Vesuvius, bearing the 

 name of Dolomieu. It was torn away with 

 long pincers from the sides of the running lava 

 in i8o5, and moulded while still hot. We also 

 find various specimens of the saline or sul- 

 phurous incrustations which line the interior of 

 craters ; they complete the collection of forma- 

 tions, which we now quit to pass into the third 

 room. 



It bears the name of the rock-room, and prin- 

 cipally contains a systematic collection of rocks, 

 classed according to their composition and tex- 

 ture. There are also the first elehients of a geo- 

 graphical collection, as well as a collection of 



