171 
of Edinburgh, Session 1872 - 73 . 
as to fill valley; this agent in its upper part (where it over- 
topped sides of the valley) moved obliquely across valley, but 
in lower part (near the bottom of valley) it followed course 
of valley. 
Hill on east side of Eiver Tay, 2 miles S.E. of Dunkeld 
about 1200 feet above sea. G-ravel and sand abound all over 
it, to top. 
On a knoll of clay slate, saw boulder of gneiss about 650 
feet above sea. It was on side of knoll facing N.N.W. 
Longer axis of boulder also N.N.W., and its sharpest end in 
that direction. 
Saw another boulder of gneiss 6 x 3 x 2£ feet, lying on well- 
smoothed slate rocks. Longer axis N.W. Height above sea 
1000 feet. Eocks evidently smoothed from N.W. 
Some of rocks on this hill show smoothings from two sepa- 
rate directions; one from north (as if down Tay Valley), the 
other from west (as if down Eran Valley). The rocks of clay 
slate are exceedingly hard, so that their smoothing indicates 
tremendous friction. 
A very extensive flat stretches south from Dunkeld about 
260 feet above sea. Eobert Chambers notices it, and says it 
is 280 feet above sea. A terrace at about the same height, 
visible on hill, skirting Tay on east side, half a mile S.E. of 
Dunkeld. Probably the sea formed both. 
Foivlis . — Abercairney estate. Granite boulder weighing about 30 
tons; about 500 feet above sea. Situated on north side of a 
valley running E. and W. Eocks in situ old red. This 
boulder, and some smaller near it, must have come from north- 
westward. May have come either by a glacier or by drift ice. 
Granite hills about 20 miles to N. and N.W. (Eev. Mr 
Hardy, and Convener.) 
Glen Lyon above Invervar . — Gneiss boulder (called “ Clach na 
Salainn,” from people who brought trees out of Black Wood 
of Eannocli resting them on the boulder), composed of six or 
seven large fragments. The whole mass about 30 yards round 
and about 3 yards high. May weigh about 120 tons. Eests 
apparently on coarse gritty sand. Must have been brought 
to present site by ice, and from northward. Height above sea 
