176 ON THE MINERAL AND METALLIFEROUS [Ch. IX. 



position. The annexed figure will show the position of the 

 different bodies at c. 



Fig. 14. 



Part of Little Bounds Lode at c. 



The granite is disposed in layers parallel with the vein, as 

 denoted by the open seams : at a distance from the vein this 

 rock is distinctly granular, composed of felspar and quartz 

 in the usual proportions, with scales of black mica. Within 

 a few layers of the vein, the quartz begins to predominate 

 over the felspar, and the mica is rather increased in quantity ; 

 then the basis of the granite becomes very fine-grained, and 

 abounds in nodules and strings of quartz ; a little nearer the 

 lode the texture of the granite is close and uniform, much 

 tinged with oxide of iron, and very hard : the mica has dis- 

 appeared, and its place is supplied by chlorite, which occurs in 

 patches intimately blended with the basis of this rock : lastly, 

 it gradually becomes perfectly quartzose, till it terminates in 

 the quartz-vein, but at the point of contact therewith, it is 

 very ferruginous : the transitions of the slate, on the other 

 side, are of a similar nature ; being, next the vein, a hard 

 quartzose rock, only differing from that on the granite side in 

 its dark blue colour, in those parts that are not tinged by the 

 iron. On the line of junction between the vein and rock, 

 open seams occur at some points, but not at others; and 

 sometimes, when present, do not precisely separate the vein 

 from the rocks, but cut off portions of the latter, in which 



