299 
of Edinburgh, Session 1876-77. 
nesia originally in separate strata. I have brought this before the 
Society in the hope that (as it can hardly be classed as a laboratory 
experiment) some of the Fellows, who may have access to a suit- 
able furnace which is in activity the greater part of the year, may 
be induced to give the experiment a fair trial. 
4. Abstract of Additional Memoir on the Parallel Eoads 
of Locliaber. By D. Milne Home, LL.I). 
Mr Milne Home stated that he had been induced to resume his 
researches in the Lochaber district, in consequence of a lecture, 
in June last, by Dr Tyndall of London, at the Royal Institution, 
Albemarle Street, and subsequently printed and published. In 
this lecture, Dr Tyndall controverted the detrital theory of lake 
barriers, and advocated the glacier theory ; — supporting his views 
by a reference to observations which Dr Tyndall said he had 
recently made on a special visit to the Parallel Roads. 
Mr Milne Home said that on account of Dr Tyndall’s reputation 
as a man of science, and his great knowledge of glacier action, he 
had thought it right to reconsider his own opinions, and go back 
to Lochaber with Dr Tyndall’s lecture in his hand. 
During this recent visit, Mr Milne Home said he had obtained 
farther information bearing on the question, which he hoped might 
be deemed sufficiently important to be communicated to the 
Society. 
He would first mention the import of this information, and then 
offer remarks on Dr Tyndall’s lecture. 
After recapitulating the grounds on which he had in his last 
Memoir suggested that the barriers of the old lakes had been com- 
posed of the natural detritus of the district, he mentioned the fol- 
lowing facts, in corroboration of these grounds — 
1. He specified several additional cases of lakes, in Stratherrick 
(a district not far from Lochaber), now kept in by detrital block- 
age, and which, owing to a partial lowering of this blockage, had 
subsided from higher levels, — these higher levels being indicated 
by horizon al lines of cliff. 
2 r 
VOL. IX. 
