746 Proceedings of the Royal Society 
came to a flat about 730 feet above the sea. He found there a 
number of boulders. The largest 4x2x2 feet, bad its longer axis 
pointing N.W. and S.E. 
Mr. Alexander told the Convener of a large boulder, 9 or 10 feet 
high, on the Farm of Taynish, at the head of a small arm of the sea, 
on Loch Sweyn, about 4 miles south of Tayvalloch. It is surrounded 
by a cluster of smaller boulders. It lies on bare rock, which slopes 
down towards the west. It is about 50 feet above sea-level. On 
the east side of it, there is an old sea bank, which may have inter- 
cepted its transport farther eastward. 
II. Ochil Hills. 
The Convener has received a letter from James Johnstone, Esq., 
of Alva, referring to the south slopes of the Ochil Hills, mentioning 
that the boulders in Alva Glen and Silver Glen are mica schist. 
In Tillicoultry Glen, he says there used to be many granite boulders ; 
but he thinks they have all been broken up for building purposes. 
He adds, that as the rocks of the Ochils are here a species of 
trap, the boulders in question probably came from the Grampian 
Hills, i.e. from the N.W. 
III. Orkneys — North Bonaldshay. 
The Convener has received the following in answer to the 
circular sent out by the Committee during last winter : — 
“ In this island of North Bonaldshay, Orkney, of which I am 
proprietor, and the rocks of which consist of Old Bed Sandstone 
flags, there are no boulders that I know of. I have, however, 
observed a mass of coarse conglomerate, like a rock which occurs to 
the S.W. at Heclabir, in the adjacent island of Sanday.* It had 
been built into a stone dyke, and was of a size too large for most 
men to carry. The surface was slightly worn, but not rounded 
like a beach stone. I have also often found smaller blocks of granite 
* Note by Convener . — Sanday Island is 5 or 6 miles from Ronaldshay. Strom - 
ness is at the S.W. end of Pomona, and about 40 miles from Ronaldshay, 
with deep seas between, and several small islands. Stromness is the only 
locality in the Orkneys for granite and syenite. In Sanday, there is the remark- 
able granite boulder weighing about 9 tons, which is referred to in the Com- 
mittee’s Second Report, p. 168. 
