190 



ON THE MINERAL AND METALLIFEROUS [Ch. IX. 



A, but its corresponding part must be looked for on the 

 north wall of theflucan, or slide to the eastward of A. * This 

 idea is certainly warranted by the theory of veins ; but we are 

 rather inclined to think that it is another instance of the 

 incompatibility of fact and opinion, which is more conspicuous 

 in this than in any other branch of the science. 



" In Dolcoath mine," says Mr. Henwood, " the elvan comes 

 into contact with several veins, by which it is intersected, 

 whilst its own course remains undisturbed : and the appear- 

 ances which result from these interferences cannot be ex- 

 plained on any assumption of motion. This elvan is twelve 

 fathoms in breadth, of a granitic character, and is situated in 

 slate, bearing 20 S. of W., and dipping about 34 N. Huel 

 Bryant cross-course, a a, runs N. and S., and dips 87 W. ; 

 the lode b b, 30 N. of W., with a dip of 82 N. ; the lode c c, 

 15 N. of W., dip 72 N. ; and, lastly, the Entral lode bears 

 E. and W., dipping 64 N. 



Fig. 23. 



Entral 



Lode 







Dolcoath Mine. (Ground Plan.) 



" The cross-course heaves the lode bb 9 feet to the left hand 



c c, 30 right ; 



* Geol. Trans, of Cornwall, vol. i. p. 152. 



