597 
of Edinburgh, Session 1879 - 80 . 
Near Loch Ranza some remarkable terraces, with boulders, ar- 
rested my attention, at heights of from 80 to 100 feet above the 
present sea-level. Great scaurs of gravel and sand, which were in 
beds, sometimes flat, sometimes dipping at a high angle, were under 
these terraces. 
6. In connection with the Arran boulders, reference may be made 
to the following : — 
Ailsa Craig (Ayrshire) is a mass of trap, — much of it (as I un- 
derstand from Professor Heddle) being columnar porphyry of a white 
colour. It reaches to a height of 1114 feet. Not having visited 
it myself, I may be allowed to refer to information given by others. 
In a paper by Mr W. N. Macartney, in the “ Proceedings of the 
Glasgow Nat. Hist. Society for 1868,” it is stated that the Craig 
bears many marks of glaciation, up to near the top. On the north 
side there is, at the height of about 600 feet, a deposit of boulder- 
clay in a slight depression of the rock, and guarded by a boss of 
rock from any currents, which, when the Craig was submerged, may 
have flowed from the N.W. This deposit is of a red colour, and 
composed of sand and clay, derived probably from the Old Red 
Sandstone rocks situated in Arran and other islands to the north. 
In this deposit, Mr Macartney says he gathered a number of pebbles, 
striated or scratched, consisting of quartz, and metamorphosed slates 
and shales. 
Mr Wiinsch of Glasgow informed me that he had found granite 
pebbles on Arran. 
(2.) At Ardrossan (Ayrshire), on the beach, there are numbers 
of conglomerate boulders, distinguishable by the prevalence of white 
quartz pebbles in the rock. 
At Lamlash Bay, in Arran, I noticed boulders of a similar con- 
glomerate. 
Have they all come from some northern quarter % 
(3.) At Millport (Buteshire) there are two large boulders of coarse 
grey granite, which are used in the harbour there as “ pauls ” for 
ropes from ships. 
(4.) Near Beith (Ayrshire) there is a hill called Cuffs , which Mr 
Craig of Beith took me to visit. On the north side of this hill he 
pointed out many small-sized boulders of grey granite at a height 
of about 560 feet above the sea. The felspar crystals in it are 
