LIFE of Dr IWrrON. ' Og 



lefs than the difcovery of a vein of filver or gold, that could 

 call forth fuch ftrong marks of joy and exultation. 



Dr HuTTON has defcribed the appearances at this fpot in the 

 third volume of the Edinburgh Tranfaaions, p. 79. and fome 

 excellent drawings of them were made by Mr Clerk, whofe 

 pencil is not lefs valuable in the fciences than in the art's. On 

 the whole, it is certain, that of all the jundions of granite and 

 fchiftus which are yet known, this at Glentilt fpeaks the mod 

 unambiguous langiiage, and mofl clearly demonftrates the vio- 

 lence with which the granitic veins were injeded among the 

 fchiftus *. 



In the year following, Dr Hutton and Mr Clerk alfo vifit- 

 ed Galloway, in fearch of granitic veins, which they found at 

 two different places, . where the granite and fchiftus come in 

 contad. One of thefe jundions was afterwards very carefully 

 examined by Sir James Hall and Mr Douglas, now Lord 

 Selkirk, who made the entire circuit of a trad of granite 

 country, which reaches from the banks of Loch Ken, where 

 the junflion is befl: feen, weftward to the valley of Palmare, oc- 

 cupying a fpace of about 1 1 miles by 7. See Edinburgh Tranf- 

 anions, vol. IIL Hijlory, p. 8. 



In fummer 1787, Dr Hutton vifited the ifland of Arran in 

 the mouth of the Clyde, one of thofe fpots in which nature has 

 colleded, within a very fmall compafs, all the phenomena mofl 

 interefling to a geologifl. A range of granite mountains, pla- 

 ced 



• I MUST take this opportunity of correfting a miilake which I have made iii 

 defcribing the junftion in Glentilt, (JUuJlrations of the Huttonian Theory, p. 3 i.a.) 

 where I have laid, that the great body of granite from which thefe veins proceed, 

 is not immediately vifible. This, however, is not the faft, for the mountains on 

 the north fide of the glen are a mafs of granite to which the veins can be directly 

 traced. This 1 have been aiTured of by Mr Clerk. Dr Hutton has not defcri- 

 bed K diftinftly ; and not having feen the union of the veins with the granite on 

 the north fide, when I vilited the fame fpot, I concluded too haftily, that it had not 

 yet been difcovered. 



