07 
upon its eastern shore, and be of tlio rocks of the Mainland, if it 
came from the east. If the ice-flow was from tlio west, the smooth- 
ing and the polishing must be seen upon the western shore of the 
islands, the eastern being rough and craggy ; and vice versa as 
regards both, if the Baltic flow reached thus far from the east. 
Upon the western shores of the Shiant Islands there lie numerous 
foreign hlucks of stone. These hloelcs of st< me are the I'oclis of the 
Long Island. 
The Shiant Isles show rounded and polished contours upon the 
west, and rough and cruggg forms upon the cast. 
The wliole evidence which the Shiants afford is thus directly 
in favour of a trend from the west, and altogether negatives one 
from the east. 
To particularise more in detail. There are two spots where 
foreign blocks are to bo found in moderate amount. The first 
is the low boulder-spit, which connects the two w'csterly islands. 
Upon the west side of this spit, from near its summit-level 
down to low-water mark, there are to be found many pieces of 
that close-veined variety of hornblendic gneiss which is common 
in Karris and North Uist, but which the writer does not remember 
to have seen of e.xactly the same character, on the mainland of 
Scotland — while the nearest locality of hornblendic gneiss on the 
mainland is not to the cast of the Shiants, but far off to the north- 
north-east. Along with this gneiss some pieces of Cambrian grit 
are to be found. A very few of the latter are also to be found on 
the east side of the spit, but tliese Avero so small in size, and 
lay so near the top of its slope, that there can be little doubt that 
they had been thrown over by the Avaves in storm. Upon the 
north-Avest shore of the eastern horn of Garabh Eilan numerous 
pieces of the same Cambrian grit Avere found, and these Avcre 
all of that yellow-spotted variety Avhich occurs, and, so far as the 
Avriter is aAA'are, alone occurs on the opposite shores of the 
Peninsula of LcAvis. 
Both Eilan an TighandGarabh Eilan are rounded and huminocked : 
Irom the Avcst in the case of the former, from the south-AA'est in the 
case of the latter. Eilan Whirry is not huminocked at all. The two 
first-named islands form Avith one another almost a right-angle on 
the Avest. .iVn ice sheet Avhich had passed either through the 
Sound of Karris, or through the deep trench at Tarbert (and ice 
