.GEOLOGY. OVLKLYIXd ROOKS. 393 



3ck, and of 



beyond the boundaries of the island. 

 Ruin and Soa must be considered as belonging to this 

 line; the former pi^ cncy caused by the 



superincumbent trap, while in the l.r ock 



dot - . >t, the bi tent throughout. 



On this line therefore, all that portion of the * 

 of Scalpa which should be found in Sky are n. \ith 



;y small portion at ^ ove 



.itioned, and here the chief mass of the Sky mountains 



.mine any other portion of the strata we 



.iiilar although not equal dene : attended 



regularities; all of them, doubtless, equally 



by the trap rocks, the effects of which seen 



.e ovenvhelining of some of the strata and the 

 displacement of others; the whole be:: rge 



ami no doubt respecting their nature, 



producing a connected train of appearances that can- 

 be traced in any other place with which I am 

 ainted. Ti. are of Arran, in some respects 



sim; . either to the sight or to that 



species of induction here used ; and the phenomena now 

 t under one general il perhaps serve 



after to illustrate other analogo ta where no 



industry can draw together the same collective proofs, 

 .dl not i to point out the revolutions that must 



have t;. parts of the earth's surface 



before s I have been produced ; still less 



to inquire into causes, in a work intended | .pie 



>rd of the p 1 -iructure of die places examined, 



as far as it is possible to give such a record its due value 

 .out a certain proportion of theoretic connexion, 

 hanges are as obvious as their magnitude is 

 at they have been produced long 

 eater part of the -re form 



v.f the ea; ted their regular distribution. 



I have r. oration of the 



