1878; 



119 



[Lesley. 



Per cent, 

 of Carl). M;ci. 



Nos. of Beds selected from the Series. 



115 



It is especially remarkable that so few of the beds occupy an intermedi- 

 ate position, chemically considered, between nearly fixed extreme limits 

 of lime and magnesia. 



Table 2. 

 In this table the beds are grouped by fives, and averaged. 



