360 TRANSACTIONS. NATURAL HISTORY SOCIETY OF GLASGOW. 
Maicu Guex, Ist June, 1895.—ArkenHEAD, llth June, 
1895.—No reports of these excursions appear in the minutes 
of the Society. 
Tuttich Hitt anp Ben Reocsu, 15th June, 1895.—This was 
a joint-excursion with the Geological Society of Glasgow. The 
party, numbering about fifty, proceeded by the West Highland 
Railway to the Glen Douglas “passing-place,” where a special 
stop was made. After leaving the train, the party passed along 
the line to the point where the road down the glen crosses the 
railway. Here the company separated into three portions, one 
going down to the side of Loch Long and walking to Arrochar, 
a second taking to the moor and hills, while a third kept to the 
railway for the purpose of examining the cuttings on the line. 
A few of the second party reached the top of Tullich Hill, and 
from thence to the summit of Ben Reoch, whence a magnificent 
view was obtained. The geological portion of the company found 
the rocks exposed along the line to be mainly metamorphic, 
possibly of Silurian age, though this point is not as yet considered | 
settled. At several places the schists have been cut through by 
intrusive rocks of various ages. In one of the cuttings the 
igneous rock has assumed a columnar form, and resembles the 
material of which Ailsa Craig is largely composed. In another 
there is a trap-dyke which is probably of Miocene age, and, if so, 
it would indicate that the deep valley of Loch Long has been 
hollowed out since that comparatively recent geological period. 
The depression between Tullich Hill and Ben Reoch forms a 
deep glen descending to Loch Long. Near the 16-mile post from 
Craigendoran, there was observed a remarkable fissure in the hill- 
side, at least 30 feet deep. It has been filled up by concrete, but 
above and to the north-east of it there is quite,a network of 
cracks in the ground, evidently land-slips, and further on there 
are evidences of former slips in the “crags, knolls, and mounds, 
confusedly hurl’d” on the face of the hill. 
BatiaGaN, 29th June, 1895.—Boranic GarpeEns, 30th July, 
1895.,—RowarpDEnnay, 10th August, 1895.—No reports of these 
excursions appear iv the minutes of the Socicty. 
