MU. H. M. WALLIS ON NATURAL HISTORY OF ARRAN MORE, 465 
Tlie rich red granite breaks out and divides, and sub-divides, and 
re-unites, hero and there enclosing blocks of gneiss which its 
up-rush has apparently torn olf. This fine example of a not very 
common natural phenomenon fortunately occurs at a point at 
which the cliff is accessible, and can be traced and followed up 
foot by foot. 
The summit of Arran More is, I think, a form of quartzite 
cropping out through a deposit of JJrift which, being denuded 
at the edges of the cliifs, reveals thousands of ti’avelled boulders, 
the waste of the inland mountain peaks, consisting of every 
variety of granite, tpiartzite, and greenstone. Those boulders are 
rounded, and water or ice worn, and lie unconformably upon the 
edges of the exposed ([uartzite and gneiss. Peat overlies all, both 
upon the mainland and Arran. This is being exhausted in places ; 
the bare, bleached, granite roches nwulonw')< are exposed over 
districts which were peat-bogs within living memory. The soil 
is miserably poor and thin. 
The Great IJlack-backed Gull is represented by perhaps half a dozen 
pairs nesting upon almost inaccessible skerries westward of Arran 
More, The Lesser Jllack-backed and Herring Gulls are common. 
No Kittiwakes wore seen until May 28th. They were 
apparently not nesting in the neighbourhood. 
The lighthouse keeper upon Arran More, who is a fair 
taxidermist, and interested in birds, showed me a Pomarine Skua 
killed there late in May. No birds seem to strike this light. 
Shags abound and breed. Cormorants 'are uncommon. They 
formerly tenanted one stack now used by the Great Llack-backs, 
but were burned out during the nesting season by the fishermen, 
acting upon the advice of a local prophet. 
A few Guillemots and Ihizorbills were seen along the cliffs of 
Arran, but they have no great breeding station upon the island. 
A single Pulfin, picked up dead upon Itutland Island, was the sole 
representative of the species noticed. 
The Plack Guillemot is common, nesting in separate pairs all 
along the coast. A pair of eggs, much incubated, was taken on 
June 1st. On the previous day a nest, which was visited, 
contained well-fledged young ; and a pair of fresh eggs was 
brought mo on or about the same date. 
On May 22nd a young Great Northern Diver was seen in the 
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