98 SOUTH UIST. GEOLOGY. 



less country. The same rock continues to occupy the 

 remainder of the group from Loch Eyiiort to Loch 

 Skiport, including Hecla ; the only substances capable of 

 attracting attention appearing to exist in the granite 

 veins, which present uncommon and beautiful mixtures 

 of grey and black quartz with white felspar. 



OF the innumerable islands which are found in Loch 

 Skiport and in Kyleslewsa, interposed between South Uist 

 and Benbecula, I examined only a few. They all appear 

 to be portions of the same rock which constitutes the rest 

 of the country, among the protuberances of which the 

 water insinuating itself, has generated a multitudinous 

 archipelago, which no patience could investigate, unless 

 under greater temptations than those presented by gneiss. 

 The similarity in the structure of Benbecula, next to be 

 described, adds a sufficient confirmation of the truth of 

 this conjecture. 



