696 Proceedings of the Roycd Society 
the stone ball may have come, and most probably came, from some 
part of that district. Mr Peach mentions in his letters, quoted in 
the Report of the Committee, that similar concretionary balls occur 
in sandstone rocks near Burntisland, and suggests that the ball in 
question came from that quarter. In that case, the direction of 
transport would be from about due N. If the stone came from near 
South Queensferry, the direction would be from W.H.W., which 
last would be more in accordance with the evidence of direction in- 
dicated by many other data. 
Assuming, then, as most probable, that the large stone ball, as 
well as the small metallic ball found in the Leith boulder clay, came 
from parent rocks, situated to the westward, the next question will 
be, by what agency were they transported 1 
Mr Peach, in his letter, apparently assumes, as matter of course, 
that these balls were transported by the agency of ice. But “ ice ” 
in what form 1 ? — land-ice, or sea-ice? 
If the metallic boulder came from Campsie, the distance over 
which it travelled to Leith could not have been less than 30 miles ; 
and as the Campsie coal strata are only about 150 feet above the 
present sea-level, there would not be gradient sufficient for a glacier 
either to carry on its surface, or to push before it, debris of rocks 
from Campsie to Leith. Moreover, Leith is not at or near the 
mouth of any valley which could create or guide a glacier from the 
west of Scotland. 
But there are in the Campsie and Kilsyth districts marks of 
various kinds, indicating the action of a deep-sea current. These 
marks it is proper to notice, as having an important bearing on 
the general question of boulder transport. 
Mr John Young of Glasgow, in the year 1868, wrote an in- 
structive paper in the “Transactions of the Glasgow Geological 
Society,” on the geology of Campsie. He says (page 14) — “There 
are few localities in the central district of Scotland, where such an 
extent of polished and striated rock surface is to be seen, as along 
the flat summits of the south hill of Campsie. The striae vary in 
their direction from a few points north of west to south of west, 
according to the deflection of the ground ; — many tracts of the sand- 
stone rock, still showing the channelled markings in great perfec- 
tion,” at about 600 feet above the sea. 
