V. Account of some remarkable Disturbances in the Veins of the Mine 

 called Huel Peever y in Cornwall. 



By JOHN WILLIAMS, Junr. Esq. 



HONORARY MEMBER OF THE GEOLOGICAL SOCIETY. 



[Read 2d June, 1815.] 



X HE county of Cornwall, in whatever part it has been explored 

 in the working of its numerous mines, has been found so devoid of 

 perfect regularity and agreement, either as regards the course, dimen- 

 sion, or contents of its veins, or the uniformity of the country they 

 traverse, that the history of any one mine can by no means be 

 considered as exhibiting a portrait of them in general. Each mine, 

 not to say each vein, will be found to have some peculiar claim to 

 attention. It is not perhaps hazarding too much, to presume that a 

 knowledge of what occurs, even to the limited depth to which the 

 Cornish veins are followed, may be found to throw some light on a 

 branch of science which is yet involved in considerable obscurity, 

 but it is to be lamented that facts have not hitherto been sufficiently 

 attended to with a view to their preservation. The object of the miner 

 is the most expeditious manner of arriving at gain ; his knowledge 

 is derived from the book of his own experience : but so greatly do 

 the circumstances attending veins differ, that they sometimes set at 

 defiance his experience, however great or general it may be. Some 

 of the most interesting phenomena attending the veins of Cornwall are 

 the interruptions they meet with from each other j these are of various 



