210 
Proceedings of the Boyal Society 
lY.— NOTES BY DR TRAILL [ORKNEY). 
Eonaldshay Island (Orkney). 
North Eonaldshay. — In the Committee’s Eeport for 1882 Dr 
Traill stated that the rocks in situ consist almost exclusively of Old 
Eed Sandstone flags. On the surface of the island there are several 
houlders of foreign origin, viz., one of coarse conglomerate^ a rock 
occurring at Heclahir, in the adjacent island of Sanday, situated to 
the S.W. ; smaller blocks of granite and syenite^ transported pos- 
sibly from Stromness, Pomona Island, distant from Eonaldshay 
about 45 miles to S.W., between which and Eonaldshay there are 
several islands and deep-sea sounds ; also a stone resembling coarse 
jasper. Some of these blocks have their surfaces flattened and 
smooth, and in some instances shining, as if they had been ground 
down and polished. 
In a subsequent communication to the Convener, dated 24th Eov. 
1882 Dr Traill states, that having recently had to cut a number of 
trenches or drains through his property near the centre of the island, 
he had found boulder-clay containing specimens of flinty chalky 
oolite, limestone, and sandstone, and other stones foreign to the 
island. A portion of one of these stones having been submitted for 
examination to Dr Heddle, of St Andrews University, he considered 
it to be a portion of augitic rock, much the same as what he had 
seen in the island of St Kilda, but nowhere else. 
In the Uorth Eonaldshay boulder clay, fragments of marine 
shells occur, especially Cyprina Islandica, and traces also of the 
more fragile Astarte and Dentalium. 
Professor Heddle writes (16th Dec. 1882) to the Convener regard- 
ing these specimens as follows : — “I send to you one of the pieces 
of flint which Dr Traill got out of the ‘ till ’ of H. Eonaldshay, to 
show how similar it is to the piece of flint you sent to me from 
Colonsay, which I have no doubt came out of Irish limestone. I 
never saw chalcedonic silica (as this is) in the least resembling it, in 
any of the Liassic beds of our West Coast. 
“ Dr Traill has also shown to me among his spoils from the Horth 
Eonaldshay ‘till,’ two unquestionable pieces of Torridon conglo- 
merate. There is no manner of doubt as to these. He saw many 
