610 
Proceedings of the Royal Soeiety 
on plate XVIII. fig. 6. On the face of the hill directly opposite on the 
Harris shore, situated to the H.W., a great bed of the same granite 
rock is distinctly visible. Two other granite boulders similarly 
“ stopped ” occur to the east of this one. 
Shiant Islands. — On the upper surface of these islands, three in 
number, all of basaltic trap, an$ reaching to a height of about 500 
feet, there are no boulders of any foreign rock. On the southern 
island there is a line of boulders not much rounded, which lie 
directly east of a spot where there has been a palpable rending. 
Two of the islands are connected by a ridge or “ ayre ” of loose 
materials, over which the waves now occasionally roll. On the 
western slope of this “ ayre ” there are much worn fragments of two 
foreign rocks, viz., hornblendic gneiss and Cambrian sandstone. 
The gneiss blocks are about 2 cubic feet in size. The conglome- 
rate blocks are sometimes as small as eggs ; two of these, but none 
of the gneiss, were found on the east side of the “ ayre.” 
On a stretch of shore along the H.W. side of the most northern 
island, conglomerate blocks also occur. 
The only place in this part of Scotland where I know of a similar 
conglomerate rock is on the Eye Peninsula of Lewis, a short distance 
east of Stornoway, and about 30 miles to the north of the Shiants. 
There is one other feature about the Shiant Islands which seems 
worthy of notice. The two highest islands, viz., Garbh Eilan 
(rough island), and Eilan an Tighe , lie north and south of one 
another ; whilst the third, viz. , Eilan Mhuire , lies to the east, and 
does not reach so high a level as the other two. 
The upper surface of the two largest and highest islands, both 
when viewed from a distance and when examined in detail, present 
such soft and gently-sweeping risings and hollows that ice in some 
form or other appeared to have passed over and pressed on the surface 
of the rocks. It had evidently gone over Eilan an Tighe from W. 
to E., and over the southern part of Garbh Eilan (lying to the 
north) in the same direction, but over the higher parts and main 
bulk of the island from the S.W. 
This movement and direction of the ice on these islands is corro- 
borated by the position of a number of boulders on both of these 
islands consisting of the basaltic rock of the islands, which are all 
on the east side of the most southerly of these islands, and in the 
