440 DOMAIN V. CALCAREOUS. 



Meudon is to the tender stone of St. Leu as 24 

 to 17- This stone being generally impure yields 

 a bad lime."* 



This important rock may be divided into two 

 structures; the simple or entire, and that min- 

 gled with shells, or the Conchitic. No example 

 of the Zoophytic seems to occur in this kind of 

 limestone, which is of recent formation. 



STRUCTURE I. ENTIRE. 



Aspect 1. Fine-grained, From Egypt. 

 From Caen, Tonnerre, and Nanterre, France. 

 From Tottenhoe, Bedfordshire. 

 From Portland. 



Aspect 2. Coarse. This is often found in the 

 same quarries. 



From Saillancourt, near Pontoise, in France. 



From Portland. 



From Scotland. 



Yellow, from Lyons, the chief building stone 

 there used. 



* Brongniart, i. 204. 



