806 
Proceedings of the Royal Society 
In the Convener’s paper a diagram was given, as shown by the 
foregoing woodcut, of a well-marked portion of the rock, where it 
slopes down towards N. 10° W. The striations are very distinct, 
running horizontally, towards E. 22° But where the rock surface 
slopes down 23° E., which it does towards the east, there are no 
striae, and the rock is only smoothed. 
(3) On the farm of Kingston, 2 miles south of North Berwick, the 
Convener found a small boulder of red granite. 
(4) A very large boulder of basalt stands on the beach, near 
Tantallan Castle, which could have come only from the westward. 
Hebrides. 
1. Islay. — (1) Near Port Askaig, on Lossit Farm, four or five 
boulders of large size. One of these 13x8x8 feet, a composite 
rock, extremely hard, containing crystals of quartz, augite, and 
hornblende ; boulder resting on bed of bright yellow clay; rocks of 
district a slaty schist. Height above sea 300 feet. 
(2) On Arnahoo Farm, 3 miles N. of -Port Askaig and 228 feet 
above sea, porphyry boulder stands on summit of hill in a precarious 
position (pi. iii. fig. 8, in Fourth Report, p. 17) {Lithograph No. 14, 
Plate VIII. ). 
This boulder must have come from a direction N. by E., as 
explained in Eeport. Mull is in that direction. Boulder is of hard 
porphyry, quite different from rock of hill. 
(3) On Persihus Farm, about 3 miles S.W of Port Askaig, 
four or five boulders, well rounded ; all, a hard porphyritic rock, 
differing from any Islay rock. Their height above sea 228 feet. 
Towards N. by E. an opening among hills, through which these 
boulders might have been carried on floating ice. 
(4) On a hill, 2 miles north of Persihus, a boulder 18x12x1 
feet, differing from adjoining rocks. Height above sea 410 feet. 
An igneous rock. 
(5) On south of turnpike road, between Bridgend and Port 
Helen, a large boulder lying at north base of a hill, which 
probably intercepted it iu its progress towards the south. 
(5) On west coast, in Kilchrenan parish below old parish church, 
several boulders, which apparently came from N.W 
