of Edinhurglij Session 1883 - 84 . 
813 
Many other boulders of the same kind are strewed over the island. 
On N.E. part of island there is a granite boulder of a larger size 
than any other, and is of a darker colour. It is on the side of a 
hill sloping down towards S.W., at about 300 feet above sea. Hill 
itself is about 900 feet above sea. Mr M‘Pherson says that he has 
seen on the shores of Loch Alsh, to the east of Skye, rocks 
resembling this boulder. 
Chips of these Eigg boulders were procured. They were sub- 
mitted to Professor Geikie. Among the chips he detected one 
which appeared to him to have come from the Torridon group of 
Old Red Sandstone, viz., the coast of the mainland to the north- 
east of Skye. 
Professor Geikie, in his account of the Geology of Eigg, adverts to 
the finding of “ pieces of Red Sandstone of Cambrian derivation,” 
which (he says) make it clear that the higher grounds from which 
they were borne could not have lain to the S. or E. but to the N. W. 
or H.” {Lond. Geol. Soe. Proc.^ vol. xxvii. p. 309) {Ninth Report, 
p. 22). 
9. Canna. — Convener told by an experienced contractor for build- 
ing that he had found on the islet of Sanda (forming the south 
side of Canna harbour) blocks of a red sandstone, which he made 
use of for the lintels and corners of a new schoolhouse. The 
largest was 6x4x2 feet. These sandstones differ from the rock of 
the island, which is a blue slaty schist, ill- adapted for building. He 
knew that these sandstone rocks abound in Rum Island, as he 
had quarried them there. 
Macculloch noticed these red sandstone blocks on Canna, which he 
says differ from Canna rocks ; and he states that similar sandstone 
rocks occur in Rum and Skye (Western Highlands, vol. i. p. 467). 
10. Barra. — A very large boulder of coarse gneiss approaching to 
granite exists here near the base of Ben Erival, on its side sloping 
down to north. The hill reaches to about 600 feet above sea-level. 
Height of boulder 28 or 26 feet, its extreme length 37 to 38 feet, 
and its width about 18 feet; assuming 2 tons for one cubic yard, 
its approximate weight would be 890 tons (Fifth Report, p. 12) 
(Lithograph No. 20, Plate IX.). 
Convener prevailed on tenant of the hill to dig under the boulder 
to discover the nature of the materials forming its site. An account 
