162 
Proceedings of the Royal Society 
any agent moving towards Treshlik Hill. There are only 
two points from which boulder probably came, viz., from 
mouth of Linnhe Loch bearing from Treshlik Hill S.W. by 
W., or from Loch Eil bearing from Treshlik Hill N.W. 
The preference must be given to the N.W. quarter, because 
of the numbers of other coarse granite boulders all along the 
north slope of hill, and of the smoothed rocks being on same side. 
Highland Railway from Forres to Kingussie cuts through immense 
deposits of clay, gravel, and sand, up to a height of about 800 
feet above sea. Some of these deposits are stratified. They 
are full of rounded blocks of all sizes. 
At Dava station, on east side of railway, about 900 feet above 
sea, rocks facing N.W. show large extent of surface glaciated. 
At summit level, viz., about 1080 feet above sea (north of 
Kingussie), stratified gravelly drift abounds. 
At Kingussie (about 730 feet above sea), two sets of terraces 
visible on the sides of valley, one about 50 feet higher than 
other, indicating existence of a lake at some former period, 
and which had been drained by barrier confining it having 
been cut through by Spey. Ruthven Castle stands on an 
isolated mass of drift, which probably formed island in this 
ancient lake at summit level of railway, viz., between Dal- 
whinnie and Dalnaspidel, about 1430 feet above sea; beds of 
sandy gravelly detritus abundant, apparently remains of 
aqueous sediment; where cut through by burns, they form 
scaurs or cliffs 50 to 60 feet high. Mr Robertson, factor, Old 
.Blair, states, in letter to Convener, that near summit level of 
railway at Drumnachdier and Dalnaspidel, there were exten- 
sive deposits cut through of “pure sand,” “so fine and soft” 
that it could not be used for building. He adds, that at a 
spot a little higher, viz., 1480 feet above sea, there was found 
(from surface) — ls£, A peat bed, 2 or 3 feet thick, containing 
fir roots ; 2 d, A layer of clayey gravel about 2 feet thick ; 
3 d, A peat bed with decayed branches of birch and hazel , and 
no fir; 4:th, Tilly gravel. 
On Cluny McPherson’s lands (about 6 miles west of • 
Kingussie) two large boulders of a very coarse grained granite 
on south side of Spey. One boulder is 11 x 9 x 6 feet. Plates 
