(44) 
should be se rare in the rocks of this particular 
district. 
To facilitate the labour of those, who may be 
inclined to look into the contents of our .Limestone, 
it may not be amiss, before quittmg the subject, to 
intimate, that although Animal Remains are gene- 
rally visible in the body of the rock, and when 
newly broken, yet, the most satisfactory specimens 
are to be obtained from those parts of it which have 
been longest exposed to the changes of the atmo- 
sphere, and the action of the weather; because, the 
animal substances; being of a more durable quality, © 
do not decompose so rapidly as the cms in 
which they are embedded, . + 
