114 Mr. William Phillips on the Veins of Cornwall, 



circumstances of disaster, and more particularly that of poverty, 

 occur to prevent their extent from being known ; but that there are 

 instances of their appearing not to exceed a few fathoms in length, 

 is evinced by the ground plans of Herland and Drannack mines, 

 accompanying this paper. In reality however the veins of those 

 mines did not terminate as represented on that plan, but continued 

 both East and West, to an unknown extent, in strings so very 

 small, as to be only just perceptible, and therefore not worth the 

 attention of the miner, whose experience induces him to believe 

 that when a vein diverges in metalliferous strings, however small, 

 they would, if pursued, be found ultimately to increase in size, or 

 to converge again, or to diverge to other veins, which are generally 

 found to be, as it were, increased in size and value thereby. The 

 East and West veins are sometimes found diverging from the straight 

 line, even when apparently unaccompanied by any circumstance 

 that might be assumed as the cause, but they generally return and 

 resume their customary direction. In Huel Fanny, I think, the 

 vein suddenly took a course to the South-East, in a few fathoms it 

 was found to alter its course again, nearer East ; afterwards it ran 

 about East, and then elbowing again, it resumed its usual direction, 

 nearly if not quite in a straight line. But circumstances of this 

 kind are by no means common. 



Ufiderlie of Veins, 



With the exception of those alluvial depositions of tin, found in 

 vallies and low grounds in many parts of the county, and in the 

 working of which the tin is separated from its accompanying earthy 

 substances by means of passing a stream of water over it, whence 

 they have been called stream 'works, neither copper nor tin is found 



