of Edinburgh, Session 1883 - 84 . 
867 
Foula Island, — Situated about 20 miles from nearest other 
island, and with a sound between, of 50 fathoms in depth {Second 
Report, p. 177). 
On this island, which has on it a hill reaching to a height of 
1370 feet, several boulders were reported to the Committee. 
The Eev. James Kussell, in 1873 (who was then resident in 
Walls), visited the island, and refers to several boulders — situated in 
the south half of the island, — the north half he had not examined. 
From the middle of the island, to south end, he reported drift as 
high up as 700 feet, containing much granite and gneiss, which he 
supposed to have come from Mainland. In the middle of the 
island there are two boulders of irregular shape, each weighing 
about 2 tons, — their composition he does not mention. 
Mr Eussell stated that at the south end of the island there are 
three boulders of gneiss and two boulders of granite, each weighing 
from 3 to 5 cwt., and which he supposed came from the Culswick 
and Delting Hills on Mainland, towards the N.E. 
Messrs Peach and Horne, on the other hand, suggest that these 
boulders may belong to rocks in situ on Foula itself, inasmuch as 
the eastern part of the island (they say) consists of gneissose rocks, 
with a mass of granite in the N.E. corner {Geol. Mag. for August 
1881, p. 372). 
Messrs Peach and Horne, however, mention that they discovered 
in the boulder clay of Foula a block of epidotic syenite from Dun- 
rossness ; — a locality which bears S.E. from Foula, separated by sea 
at least 50 miles in breadth^ and having a depth of 70 fathoms. 
Houssay Island. — Oti a clitf 200 feet above sea there are loose 
blocks resting on rounded and polished rocky knolls ; the knolls 
having been evidently polished before receiving the boulders {First 
Report, p. 43). 
Rapa Stour Island was visited by the late Dr Hibbert in the year 
1822 {Edin. Journ. Science for 1831, vol iv. p. 86). He found in it 
several peculiar schists, foreign to the island, apparently derived from 
rocks at Hilswick Ness, situated to the N.E., and distant about 12 
miles across St Magnus Bay, which has a depth of 40 fathoms. 
This island Was visited also by Professor Geikie, who states that 
he found on it many “ transported blocks of gneiss, schist, and 
other rocks foreign to the locality ” {Nature, vol. xvi. p. 415). 
