486 Mr. He ns low’s Supplementary Observations to 
runs through Foxdale, and there are also several places on its 
summit which are laid bare in a manner similar to those mentioned 
near the Dun. The stream affording this section rises on the 
eastern side of south Barrule, crosses the road between Castletown 
and St. John’s near the sixth mile-stone, and after flowing through a 
small extent of boggy land, suddenly turns down the slope on the 
side of Slieu-ny-clough in a northerly direction. Another section 
is formed by a stream running on the same side, but down the 
opposite slope of the hill, and here the granite is soon lost beneath 
mica-slate, but towards Kirk Marown it once more appears at an 
elevation not so great as before. 
The aspect of the granite forming Slieu-ny-clough is very 
different from that found near the Dun ; the materials of which it is 
composed are in general large grained, especially towards the summit 
of the hill. On comparison with various granites in the collection 
of G. B. Greenough, Esq. it appears closely allied to that from Dalky, 
in Ireland, and also to some towards the southern extremity of 
Scotland, and it is worthy of remark, that these three localities are 
situate in nearly the same straight line. 
On Slieu-ny-clough itself, I did not perceive any gneiss, but 
between this and Kirk Marown church, it occurs in a few places ; 
at a hill about midway, behind the Garth, and close to the church. 
At these places it rises through the clay-slate presenting a bare rock 
in the midst of verdure. The felspar often greatly predominates ; 
it then has a compact texture with a few spots of mica and quartz 
dispersed through it ; the fracture conchoidal ; the structure thick 
slaty. A similar gneiss is met with on Slieu-ny-carnaane. No 
section is formed in it, but it appears to lie in a bed penetrating the 
mountain in a direction about north-east by east. Broken masses 
occur disposed in an elevated ridge, and which, from the direction 
