629 
of Edinburgh, Session 1879-80. 
Long Island are plentiful, all indicate a movement from the N.W. 
— a direction the very opposite of that requisite for a great glacier 
from Ross-shire. 
Mr Geikie, in a footnote (page 60), says that “ Mr Campbell of 
Islay considered that the Hebrides Islands had been glaciated by 
sea-ice coming from the N.W. ; — while, on the other hand, my obser- 
vations in Lewis compelled me to believe, that the glaciating agent 
was land-ice streaming outwards from the mainland. My colleague, 
Mr Etheridge, Jun., who accompanied me during my last visit to the 
Long Island, also concluded, that the glaciations had been effected 
by land-ice coming from the S.E.” 
Whilst much weight is proper to be given to the observations and 
opinions of such experienced geologists as Mr James Geikie and 
Mr Etheridge, on the other hand it is only right to keep in view 
that the late Robert Chambers and Dr Bryce, though they wrote no 
papers on the subject, are known to have concurred with Mr Camp- 
bell; and I have reason to believe, that Mr Jolly of Inverness is 
of the same opinion. 
7. Black Mount District. 
(1.) Some white granite boulders, which were noticed by Pro- 
fessor Heddle on the shores of Loch Tulla, were, after a minute and 
laborious search, traced by him to a hill called Albannach , situated 
about 10 miles to the W.N.W. Professor Heddle having ascertained 
the line of transport, next tried to find whether the boulders covered 
a large space transversely. The result of this search was to show that 
(to use the Professor’s words) “ these boulders had been carried, as it 
were, in a stream, and one of no great width, towards the S.E.” 
(2.) bfotice was next taken of several large boulders, one weigh- 
ing no less than 1900 tons, in a valley, which becomes very 
narrow to the east of Loch Dochard. The Professor says, “ Tf any 
powerful agent passed through this valley, there would be great 
obstruction and a violent pressure on and rending of the adjoining 
rocks. The lower part of the pass (he says) contains much till ; and 
occasionally rock rises up through the till with finely-smoothed 
hunches, showing striations from the W.H. W.” In reference to the 
large boulder above referred to, Professor Heddle gives his opinion 
that “ nothing but ice could have brought it into its present 
position.” 
