83 



must hav€ been the accession of air when th$ 

 springs in dry seasons were low. 



The grey marie, in which many of the 

 bones lay, by analysis was found to contain 

 seventy-three parts in the hundred of lime : 

 when dried in the sun it cracks into thin hori- 

 zontal laminae, and becomes extremely Hght, 

 as hard as baked clay, and brittle; in this state 

 it burns with a bright flame for a long while, 

 and instead of leaving ashes, it remains a 

 strong black coal, apparently well adapted to 

 the purposes of the arts. 



These various strata are the production of a 

 long succession of ages, and undoubtedly have 

 been formed over the bones. In two of the 

 morasses there was not depth sufficient to 

 have bemired an animal of such magnitude 

 and strength; and in the third the bones were 

 lying near the sloping edge, from which some 

 of them had already been washed farther in. 

 The animals have either died or been destroyed 

 generally over the country, and only in these 

 situations have been preserved ; or they have 



M 2 



