578 Proceedings of the Royal Society 
taming crystals of white felspar, somewhat similar to the Southend 
boulders. The gas manager informed me that he believed there was 
rock of the same nature a few miles to the north. 
In the valley of Brackerie I found rock of a crystalline nature 
somewhat similar in composition to the boulders above described ; 
and at a place in the same valley, called Collielangart, I saw a 
monumental pillar, about 8 feet high, similar in composition, said to 
have been obtained from Glenlissa, a place about 3 miles to the 
N.W. of Campbelton. I was informed also that boulders of this 
same rock, weighing 2 or 3 tons, had lately been observed in a recent 
cutting into boulder-clay to the north of Campbelton. 
Professor Nicol, in a short account of the Geology of Cantyre in 
the “ London Geological Society’s Journal” for 1852 (vol. viii. p. 
421), refers to the boulders at and near Southend. He describes 
them as white granite , and as resembling a granite in Arran, from 
which, therefore, he supposed these Southend boulders had somehow 
been transported. Professor Mcol takes notice of several striated 
rocks on the east coast of Cantyre, one of which showed a direction 
of E. 10° H. by compass, which he remarks is nearly parallel to the 
line of coast, and in the direction of Arran, 25 miles distant.* 
There was only one spot where I found a smoothed rock, viz., 
about a mile to east of Campbelton. It sloped down to N.H.W. at 
an angle of 40°. There were no striae. 
I offer no positive opinion regarding the position of the parent 
rock from which these white granite boulders came. It is pretty 
clear, however, that those at Southend must have travelled from the 
north, and many of them there are lying on the Old Red Sandstone 
strata which fringe the south-west coast of Cantyre. 
Another part of Cantyre visited by me was the district between 
Campbelton and the west coast at Drumlenbie and Balahunty. 
Hear Kilhenzie , a few miles west of Campbelton, there are hills 
reaching to a height of from 500 to 600 feet, well covered with 
detritus ; and on their western slopes there are numerous boulders of 
* With reference to Professor Nicol’s view that the white granite boulders 
seen on the east and south’ coast of Cantyre came from parent rocks in Arran, 
it is right to notice that the late Rev. Mr M ‘Bride of Rothesay, who was a 
good geologist, and well acquainted with the rocks of the West Highlands, 
suggested a more northern source (Bryce “ On Arran,” 4th edition, p. 337). 
