of Edinburgh, Session 1880 - 81 . 
271 
siderable elevation, more or less continuous, which stretch north- 
ward, commencing near Rowardennan, to the south of Ben Lomond, 
and reaching to the neighbourhood of the Dochart and Loch Tulla, 
where the stream of boulders was first recognised by him in the 
previous year. 
1. This accordingly was the general line of route he decided to 
take, and the following is a diary of his explorations. 
First Day. — Rowardennan to Inversnaid, by Ben Lomond (3192 
feet). 
Near Rowardennan, much appearance of glaciation along banks 
sloping to the loch, showing a southerly movement. 
A dyke of Diorite strikes eastward above Rowardennan to a 
height of about 450 feet. A few small blocks from this dyke lie 
a short distance from it on its south side ; — but there are none 
on the north side. 
At the foot of the north slope of Ben Lomond , a very unusual 
and characteristic Greywacke rock in situ was noticed. It contains 
nodules of milk-white quartz larger than almonds. It will be referred 
to when an excursion along the Ochils comes to be mentioned. 
No noticeable boulders were found. 
Second Day. — Crossed Loch Lomond, and went along the whole 
ridge of Ben Vorlicli , and over its two summits (3092 and 3055 
feet) on to Inverarnan. No boulders were seen . 
Third Day. — Berried the River Arnan, and went along the terribly 
rough ridge of Ben-a-Chabair (3054 feet) ; then down into the col 
between it and Ben-a-Chastle ; then up to the top of Ben-a-Chastle 
(3265 feet) ; then down along its ridge (where saw the Brocken , for 
the second time in Scotland) to Crianlarich. No boulders. 
Fourth Day. — Went over Crag Loisgte (2750 feet), Ben Challum 
(3354 feet), down to Strath Lochy; then over Stron-nan-Eim 
(2747 feet) and Creag Mhor (3387 feet); then, down into the col 
between its second top and Cam Chreag (2887 feet) ; next, over the 
latter into Glen Choilleun , then, over Beinn Odhar (2848 feet) and 
down its ridge, back to Crianlarich. No boulders seen. 
But in the col between the second top (name not given in inch 
map) of Creag Mhor and Cair Chreag , some interesting and 
puzzling appearances attracted attention, which the Professor says 
he had noticed in other parts of Scotland. 
2 M 
VOL. XI, 
