of Edinburgh, Session 1878-79. 
193 
1. Pentland Hills. 
The impression hitherto had been, that the boulders on these hills 
indicated a movement exclusively from the north-west ; and there is 
no doubt that the mica slate boulders on these hills indicate such 
a direction ; but Messrs Somervail & Henderson, in the notes con- 
tained in this Report, have discovered a separate movement from 
the west-south- west, by the occurrence of certain sandstone blocks, 
which they think can be traced to a particular hill or hills in the 
Pentland range. This point is so important, that it is hoped further 
inquiry may be made regarding it. 
2. Morayshire. 
The boulders in this country are described in a very interesting 
Report by Mr Jolly, Inverness, a member of the Committee. 
Mr Jolly’s concluding paragraph deserves notice. He says, “ Hone 
of these boulders are to the west of the points in situ where the 
parent rock is found — ?at least I have found none, and I speak 
from a pretty extensive knowledge of the district. What the 
transporting agent or agents were, whether glaciers, icebergs, ice- 
floes, or water-currents, or one or more of these together, how- 
ever interesting and important, it would be foreign to the purpose 
of the present paper to consider ; but that these rocks were carried 
from their native sources, and scattered widely and numerously 
to the eastvmrds , over a large extent of country, cannot for a 
moment be doubted.” 
3. Islands of the West Coast, and part of the Mainland. 
It will be seen from the Report that my own personal survey last 
summer was chiefly among the islands, which, commencing with 
Iona at the south, stretches through the Western Hebrides to the 
north end of the Lewis, a distance of 120 or 130 miles. I selected 
these islands for two reasons : — 1st. Because the boulders on them 
would be in their original undisturbed positions ; 2d. Because one 
of the agencies by which transport of boulders has hitherto been 
most commonly explained, i.e., local glaciers, could hardly be adopted 
for these island boulders. The highest mountain in any of these 
islands does not exceed 2000 feet, and on most of the islands the 
height of the hills does not exceed 500 feet. Moreover, even in the 
