179- 

 Feb. 15. 



Mr Hunter on 

 the Latin com- 

 pound pel feci 

 tenfe. 



8 HISTORT of the SOCIETT. 



Lit. CI. Mr Dalzel read a paper on the Latin compound 

 perfect Tenfe, by Mr Hunter, ProfelTor of Humanity in the 

 Univerfity of St Andrew's. 



March 1. 



Sir James Hall 

 on granite. 



Pbyf. CI. Sir James Hall communicated the remainder of 

 his paper, viz. Obfervations on the Formation of Granite. 



Sir James Hall declined putting the two papers above men- 

 tioned into the hands of the Committee for publication, as they 

 refer to Dr Hutton's Theory, which the author has not yet 

 explained fo fully as he intends, but which he is preparing to 

 give, accompanied by that variety of proofs and illuftrations, 

 which the profound reflection, and extenfive obfervation of 

 many years have furnifhed him with. The following abftract 

 of them, therefore, is all that Sir James thinks it proper to 

 communicate at prefent. 



The firft paper was fuggefted to him by a mineralogical 

 excurfion which he made in 1788, in company with the Ho- 

 nourable T. Douglas, among the mountains of Galloway, in 

 order to examine into the curious facts refpecting the junction 

 of the granite and the fchiftus, which were firft obferved by 

 Dr Hutton, as related in his paper mentioned above, and foon 

 after communicated by him to Sir Ja%es Hall. Sir James 

 accordingly having met with the line of feparation of thefe two 

 bodies, continued to follow it till he made the entire circuit of 

 a confiderable tract of granite country, which reaches from 

 the banks of Loch Ken, where the junction is moil diftinctly 

 feen, to the valley of Palnure, and occupies a mountainous 

 fpace of about eleven miles by feven ; and in all this extent, 

 he found, that wherever the junction of the granite with 

 the fchiftus was vifible, veins of the former, from fifty yards, 

 to the tenth of an inch in width, were to be feen running into the 

 latter, and pervading it in all directions, fo as to put it beyond 

 all doubt, that the granite of thefe veins, and confequently 

 of the great body itfelf, which he obferved forming with the 



veins 



