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Proceedings of the Royal Society 
place to the Rev. Mr M‘Donald of Helipol, who was the Convener’s 
guide on this occasion, is that three giants living in Barra, wishing 
to try how far they could throw a stone, took the largest pebbles 
they could find at Barra, and flung them in the direction of Tiree, 
which is situated S.E. of Barra, and about 40 miles distant. The 
story goes, that the stones reached Tiree, and fell very near one 
another. The knoll referred to is clustered over with huge boulders. 
Three or four are from 8 to 10 feet high, and from 20 to 25 feet 
along each side. There may he about 20 or 30 boulders of all 
sizes ; they are on the knoll, and none on the flat ground adjoining, 
a circumstance suggesting that the knoll, by being above the adjoin- 
ing surface of the land, had intercepted the agent which was carrying 
the boulders, and caused them to he deposited there. 
3. “ Ben Gott ” hill, on the north side of Tiree, forms a ridge 
running north and south for about a quarter of a mile, and is 
from 120 to 130 feet above the sea. A very large number of 
boulders, chiefly gneiss, are on its H.W. flanks. A few occur on 
the flat summit, and some are also on the S.E. slope, as if they had 
been pushed over the top from the N. W. On the flat ground beyond 
the limits of the hill towards the S.E. there are few or no boulders. 
4. In Tiree, the evidence of the sea having stood recently at a higher 
level is very striking. On a great part of the island there are exten- 
sive beds of a stratified muddy sand, sometimes 15 to 20 feet deep, 
evidently a sea deposit. In other parts of the island there are huge 
beds or banks of shingle, composed chiefly of well-rounded pebbles 
of hard gneiss rock, similar to what occurs on the existing shores of 
all the Hebrides, at places exposed to the action of heavy sea waves. 
The pebbles in these shingle banks sometimes are twice the size of a 
man’s head, but the great mass of the pebbles are half of this size. 
They point to a period when the sea must have stood here at least 
40 feet, probably more, above the present level, and when, by the 
force of the waves, fragments of gneiss rock were worn down into 
elliptic, and sometimes even perfectly spherical, forms. The Con- 
vener brought away a few specimens. 
HI. — ISLAND OF COLL. 
1. Under the guidance of the Rev. Mr Fraser, Free Church 
minister, the Convener visited Bein Hock, a hill on the west side of 
