DILUVIAL REMAINS. 11 



is very free from impurities, containing in a hun- 

 dred parts 



Carbonate of lime . . .88 



Magnesia . * . . 8 



Silex . .... 1 



Alumine *, coloured with iron . . 3 



Too 



Another quarry presents, likewise, unquestion- 

 able evidence of an animal origin, veins of it being 

 composed of shattered parts of shells, and marine 

 substances, greatly consumed and imperfect, em- 

 bedded in a coarse, gray, sparry compound ; an 

 ocean deposit, not a fabrication, and consequently 

 has more impurities in its substance than that of 

 insect formation : it contains about 



Carbonate of lime . . .73 



Magnesia . . . . 11 



Clay 14^ 



Silex . . . . 2 



100 



These two specimens so clearly prove that the 

 original materials of their substance were derived, 

 from the deep, that no further arguments need be 

 advanced to support this fact as to our limestone. 

 The former is ; perhaps, the mountain limestone of 

 Werner ; the latter a variety of dolomite. Our 

 other quarries, as well as the lower strata of the 

 above, present no such indications of animal forma- 

 tion, and they are probably sediment arising from 



* I have called this alumine, stained with oxide of iron ; but it 

 seems more like vegetable or animal remains, adhering to the filter 

 like a fine peaty deposit, and is lost in combustion. 



