57 



the deep ground, where there is only a remote probability of 

 the existence of an auriferous lead, could not be worked except 

 at very great expense. Again, the quartzose veins of the 

 porphyry have not yet been seen developed in any practicable 

 shape. Attention has however been directed to the subject, 

 and it is by no means improbable that continuations of these 

 veins will some day be traced into the more substantial forms 

 by which, under similar geological conditions; they are else- 

 where represented. 



