12 



separated from those which contain two, or four ; 

 and thus also shale, and jasper, or claystone, and 

 limestone, or micaceous schist, and sandstone 

 containing mica or carbonate of lime, would be 

 found in the same division. 



It would be abundantly easy to illustrate these 

 different remarks by innumerable examples ; but 

 it is here unnecessary, as the geological reader 

 can easily supply them, and, to the student, they 

 could not be rendered intelligible without anti- 

 cipating that which he cannot yet be supposed to 

 understand. 



Nor can any system be suggested, as far as 

 can be perceived, formed on such a basis, that 

 will not somewhere produce confusion and incon- 

 venience similar to these : and it must indeed be 

 obvious, that it possesses the deceptive rather than 

 the real characters of a natural method. It is un- 

 necessary to examine the several modes of arrange- 

 ment on such a mineral ogical principle, which 

 have been, or might be suggested, as it would 

 prolong these criticisms to little purpose. 



If now, the structure * or rather, the texture. 



