626 
Proceedings of the Royal Society 
had probably come, founded solely on the position and attitude of 
the boulders themselves, the correctness of which inference has 
now been confirmed by the discovery of the particular districts 
where the parent rocks are situated. 
II. Professor Forster Heddle’s Explorations. 
The Professor’s survey last year began on the West of Scotland, 
and extended from Ayrshire to Loch Torridon in Argyleshire ; and 
also into the interior, near the districts called the Black Mount 
and Glencoe. 
I was especially glad, on receiving the Professor’s notes, to find 
that he had visited several of the islands of the Hebrides; because, 
as was explained in our last year’s Eeport, the problem of the mode 
of transport becomes less complex on islands where there are neither 
hills nor valleys suitable for the formation of local glaciers. 
1. The first island visited was Colonsay , — on which, however, 
nothing seems to have been found, beyond rock striations running 
W.N.W. and E.S.E., but which way the movement was, did not 
appear. 
2. The next island was iVist. There, in like manner, the rock 
striations were W.1ST.W. and E.S.E., and it was there seen that 
the striating agent come from the westward. The Professor adds, 
that “ the hollows or trenches between the higher grounds and the 
strike of the old gneiss strata have exercised some influence, in 
diverting the smoothing agent, sometimes one way and sometimes 
another.” 
At Loch Maddy in Uist, Professor Heddle met w T ith Mr Harvey 
Brown, who had been for some time surveying there for objects of 
natural history, in company with Mr James Thomson, a member of the 
Glasgow Geological Society. Both of these gentlemen had also been 
studying the phenomena of boulders and striated rocks in the north 
part of Uist. Mr Brown supplied Professor Heddle with a note of 
the size of several boulders (which are specified in this Report), and 
he recommended the Professor to write to Mr Thompson for farther 
information. The Professor did so, and the answer he received from 
Mr Thompson was, “ That the glaciation on the west shore of the 
Long Island was all from the west, varying occasionally between 
H.W. and S.W. and he “ added (the Professor says) an expres- 
