678 Proceedings of the Royal Society 
provincial name is “ Ker stone Galloch” it is situated on the farm of 
Callendoon, and is about 150 feet above the sea. Its length is 28 
feet; width 19 feet; depth 12 feet. 
It is shown on fig. 11, Plate III., with Mr M‘ Arthur, tenant of 
the farm, standing on it. 
Originally, the boulder had been in a somewhat higher position. 
A small stream running past the boulder at its east side had washed 
away part of the gravel bed on which it had been resting, — so allow- 
ing it to sink. 
With reference to the quarter from which this boulder was trans- 
ported, Mr Jack suggested that if it came from the west, it must have 
come over hills from 1000 to 1200 feet high ; and therefore he thought 
it more probable that it had been floated south down the valley now 
occupied by Loch Lomond, and then floated west up Glen Fruin. 
It appeared to the Convener, that the line of transport was more 
likely from the westward. The land towards W. by N. (true), is 
on about the same level as the land to the north-east, as shown by 
the contour lines on the Ordnance maps of the district. If the 
boulder came from the westward, there would he no obstruction to 
its progress in a direct line ; whereas, if it came from the north 
end of Loch Lomond valley, as suggested by Mr Jack, it must have 
changed its course to reach Callendoon. 
2. On a moor, about half a mile to the north east of the above 
boulder, there are several smaller boulders of mica schist, of the 
shapes and sizes shown on fig. 12, Plate III. 
It will he observed that they all occupy similar positions in respect 
of their longer axis, and their sharpest end. Their height above the 
sea is about 250 feet. The rocks of this district are Old Eed Sand- 
stone. There is much probability that these boulders had been left 
here by floating ice, in a current flowing from the westward; and 
that they acquired their hearings from the action of the current. 
3. On the west side of Loch Lomond there is at Arden a low 
valley, which runs up from the Loch in a westerly direction. The 
summit level of this valley towards the west is about 150 feet above 
the sea. 
Along the south side of this valley a number of bouldeis, chiefly 
of primitive rocks, have been deposited. They are at a height 
of about 94 feet above the sea. As usual, the most frequent position 
