Dr. Mac Culloch on the Hill of Kinnout, 229 



calcareous spar, and exactly resemble those which occur in the trap 

 rocks themselves. 



I remarked above, that the schist is often much contorted and 

 mixed with the trap. This mixture affords a great variety of appear- 

 ances, a variety so great that no limited series of specimens, nor 

 any drawing less than that of the whole face of the hill itself, could 

 give an adequate idea of them. *The accompanying sketch exhibits 

 one of the most general. In many parts innumerable detached 

 fragments may be seen imbedded in the trap, the whole of the 

 schist displaying a greater disorder and confusion than the sand- 

 stone does in any of the instances hitherto described. In a few 

 places another singularity may be remarked. Veins of differ- 

 ent dimensions, and ramifying in different directions, are to be 

 found traversing considerable portions of the rock, and in some 

 instances terminating in the schist, with which they are continuous. 

 As the schist graduates into the vein, its laminated texture disappears, 

 but in other respects there is an identity of composition between 

 the vein and the laminated schist, at least for a considerable space. 

 The same loss of the laminated texture of the schist takes place 

 wherever, from its proximity and intermixture with the trap, it is 

 materially perverted from its original even direction. In other 

 respects the identity of substance is here, as in the other case, pre- 

 served, nor is any decided line drawn to determine the disconti- 

 nuation of the laminated structure, either in the progress to contor- 

 tion or ramification. However contradictory it may appear at first 

 sight, that the same substance should exhibit both the character of 

 a laminated and bedded rock and that of a vein, the state of the 

 incurvated and contorted masses may perhaps by analogy assist in 

 solving the difficulty. It is not an unreasonable supposition, that 



* Vide Plate, 11. 



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