226 Analysts of Books, [March, 



respect to the rocks in Derbyshire. The inference which is 

 intended to be drawn from all this seems to be, that the beds 

 may be identified in all these different places. In our judgment, 

 there is no ground whatever for such an opinion; but the gentle- 

 men of the north are so pleased with the accurate way in which 

 they can calculate on coming to a particular bed, that they are 

 very apt to imagine that their rules would apply all over the king- 

 dom, if people would but understand and use them. 



Kow m Arkengarth Dale are the chert beds, which are not to 

 be found in Mr. Forster's section, and the only coincidence 

 seems to be a bed of limestone of 12 fathoms thick. 



Before we get to Derbyshire, there are mining fields not men- 

 tioned, such as Paitly Bridge, in Yorkshire, where, on Greenough 

 Hill, it is limestone from the surface to the full depth of the 

 mines, say 50 to 60 fathoms, and on the other side of the town, 

 some extensive mines are in gritstone only. At Grassington 

 Moor are a few beds of metalliferous gritstone alternating with 

 plate, and under these is limestone already proved to a great 

 thickness, and of unknown extent in that respect. 



As to Derbyshire, it appears to us that in no place is stratifi- 

 cation more irregular, nor do we pretend to understand Mr. 

 Farcy's arrangement of its parts, but it may be observed that on 

 the western edge of the county is one of the deepest mines in 

 England, we mean Ecton, and that is carried to the depth of 

 225 fathoms from the surface, and nothing occurs all the way 

 down but limestone. The toadstone beds, we believe, ought to 

 be there, but unfortunately they are not to be found. Mr. Farey 

 calls this limestone, shale Hmestone, but that is only true in part. 



The fact is, that no rules for mining in one country can be 

 laid down as fit to be followed implicitly in another, and that a 

 simple detail of things as they are, is what we think should be 

 aimed at by authors of such works as the present. 



We object also to swelling out a book by long extracts from 

 other aumors, and in particular we do not see why the account 

 of the Huttonian and Wernerian theories should have been 

 transplanted from Dr. Miller's edition of WilUams's Mineral 

 Kingdom. 



Having now gone through the first and most important part of 

 the book, the treatise on the sections, we must close our obser« 

 ration? for the present. Z. 



