of Edinburgliy Session 1883 - 84 . 
847 
saw several specimens of sncli balls, apparently concretions in 
the rock. Having brought one or two specimens to Edinburgh, he 
submitted them to Professor Crum Brown, who reported that they 
“ consist externally of a thin shell of sandstone, and internally of a 
mixture of quartz and marcasite, closely resembling the substance of 
the large ball from Leith. The mean specific gravity of the ball 
was 3-49.” 
These facts regarding the two metallic boulders found in the Leith 
boulder clay, therefore afford strong presumptive evidence that they 
had been transported across Scotland, along with other bouldres, 
whose parent rocks occur also in the west. 
As to the mode of transport, Mr Peach, in his letter to the Con- 
vener (printed on p. 29 of Fourth Boulder Report), whilst allowing 
that the balls might have come from Kilsyth or Slamannan, in con- 
formity with the general “ direction of the striae and carry of the 
boulders in this district,” viz., E., or E. 5° N., suggested ^Hce-jloio^^ 
as the medium of transport, but without explaining whether he 
meant sea ice or land ice. 
With reference to this question, it is right to keep in view that 
the Campsie district, from which the metallic boulders are assumed to 
have come, is only 150 feet above the present sea-level ; and that, 
as this district is about 30 miles distant from Leith, the gradient 
would not be sufficient for the movement of a glacier, even if there 
had been mountains at or near Campsie sufficiently high to have 
generated a glacier."^ 
8. Alnwick Hill, near Liherton. — Excavations having been made 
in the boulder clay here, for the formation of large water reservoirs, 
innumerable boulders were excavated. They were chiefly whin- 
stones, felspar, porphyries, limestones, and Old Eed Sandstone — all 
most probably from the K.W. 
Some of these boulders showed strise both on the under and the 
upper sides, the direction of wliich was approximately K.W. {Fourth 
Report, p. 29). 
Inchkeith. — The Convener visited the island, under the guidance 
of Colonel Muggridge, RE., and found that the rocks consist chiefly 
of basalt and porphyry, intruding among coal strata. In various 
* A small map of district, given afterwards in reference to Stirlingshire 
boulders, may here he referred to. 
