870 Earl Compton on the Rocks of the Isle of Mull . 
part of the coast, in one of these recesses, is situated the farm 
house of Carseg, which may be taken as a fixed point from which 
to proceed. About a quarter of a mile to the eastward of it, 
I passed a small quarry of free-stone ; this may be about the same 
distance from the shore, and about fifty or sixty feet above the 
level of the sea. I speak from recollection, having made no 
memorandum on this particular point at the time. 
About a mile further on, are three whin dykes, visible in the 
rock, and very near to each other, (Plate 19. fig. 1.) The first of 
these dykes is nearly perpendicular, about one hundred and twenty 
feet in height, and about five feet and a half in width near- the 
ground ; but I understand from a gentleman who has since visited 
it, that he has ascertained it to be about seventeen feet in width at 
the top. Part of this dyke has fallen, and has left a recess in the 
face of the rock, about fifteen feet in depth at the summit, and 
about seven below. The face of the rock, which i& basaltic, is 
formed of small columns in different directions. The second dyke 
is about the same thickness and height, contorted, and dipping a 
good deal to the eastward of the perpendicular. The third dyke, 
which is but a few yards distant, is seen at the turn of the rock, 
and again at another turn immediately following. It is about the 
same thickness as the other two, and dips very much, perhaps about 
forty-five degrees to the north-east. It is lost after its second 
appearance, sinking into the ground in a small cavern. 
Beyond this is a fine cascade, about one hundred and ten feet in 
height, called Urie na Claorich a Buie, with basaltic columns, 
nearly perpendicular. The rock after this rather rises in height, 
and again displays fine basaltic columns. Very near this, ano- 
ther whin dyke is visible, almost perpendicular, though a little 
contorted. Further still, are some remarkably fine basaltic columns y 
