784 
Proceedings of the Royal Society 
shore as often covered by blocks of stone which have rolled off the 
land, and which, when floated away from the shore, drop their 
cargoes. These possibly may form rows on the sea-bottom, if the 
ice raft followed a straight track, or if an iceberg ploughed its 
way among the boulders when on the sea-bottom, and pushed them 
aside into approximately straight lines. 
Professor Puns, whilst narrating the facts observed by him, has 
avoided theoretical speculation ; hut, after completing his record of 
facts, he concludes his notes by observing that “ a careful examina- 
tion of the deposits within the area described, so far as they bear 
on Arctic conditions of climate and a glacial surface, leads to the 
belief that the bulk of the phenomena may ultimately find their 
explanation in the recognition of two movements, one outwards from 
Ben Nevis as a centre, the other a force travelling from the W., 
the H.W., or the N1W.” (page 23). 
I presume from this remark that Professor Puns means that there 
have been two separate agencies, viz. (1) glaciers which filled the 
valleys and covered the mountain sides, and, after the land was 
submerged (2) floating ice , which came from the directions indicated 
by him. 
If that view be correct, future observers in the Ben He vis district, 
(and there is still an ample field there for further exploration), should 
endeavour to study what are the traces of each separate agency. 
Whilst Pr. Heddle in his Ben Nevis excursions has seen mostly 
the traces of glacier action, he has elsewhere very clearly pointed 
out the evidence of a great and general movement over the country 
from a westerly direction. In the notes supplied for this Eeport 
he gives an example of blocks disrupted from a vein or dyke of 
white granite, in Glen Finnan, illustrated by a diagram (page. 32), 
carried up hill and for about one-third of a mile to the eastward ; 
and he has also pointed out, as lying on the Ochil Hills, boulders of 
dolerite, red granite, and almond conglomerate, which he has 
identified with rocks in situ, some of them twenty miles distant, 
situated to the westward (page 31). 
2. Another district which has been well surveyed is that near 
Inverness, and chiefly to the S. and S.E. A list of no less 
than about twenty large boulders in that district has been sup- 
plied by Mr. Wallace, master of the High School of that town; 
