NATURAL HISTORY. 
sand, a still more recent member of the secondary 
class, and which rests immediate!y on the last with- 
out any of the members of the oolitic formation (as 
is elsewhere the case) interposing, There appears 
to be nothing very singular in this, as it is a gene- 
ral fact, that the more recent the strata, the more 
limited is their extent, and the more partial 
their distribution ; for instance the chalk does not 
extend to us, tho’ the beds of flint incumbent on 
the green sand, appear to be interrupted portions 
of those resting on that formation in Dorsetshire. 
The Bovey clay basin, containing the brown coal 
deposit, has already been bored to the depth of 
200 feet through a coarse gritty clay—whieh bo- 
ring had it been farther continued, would most 
probably have reached some rock of the primitive 
class, as appears from the geological character of 
the neighbourhood on either side this curious de- 
posit. 
In conclusion, we may observe that our objeet 
in drawing up this part has been two-fold. First. 
To furnish the accomplished naturalist, who may be 
