694 
Proceedings of the Royal Society 
The answer is, that the Committee can in no case point out the 
particular rock from which a boulder had originally been broken off. 
All they can affirm is, that in several cases they have ascertained 
the district or quarter from which the boulder must have come. 
(1.) For example, in Berwickshire, as will be seen from this last 
Report and the second Report, particular hills are specified from 
which boulders must have come. The direction in which they 
came, and the number of miles traversed, are therefore in these cases 
matter of certainty. In every case over the whole county of Berwick, 
from its lowest to its highest level, the direction of transport is 
from points between W. and Iff W. (magn.) 
The same is the case in Mid-Lothian. The sandstone boulders at 
Craiglockhart are shown to have most probably come from rocks 
situated a few miles to the Iff W. The quartz and other hard rock 
boulders at the same place, as also at Liberton and at Leith, in like 
manner probably came from points between W. and IffW. 
(2.) The two remarkable spherical balls of marcasite, found in the 
boulder clay at Leith and mentioned in this Report, must in like 
manner have come from the westward. A presumption to that 
effect arises, from the mere fact that they are in the same bed of 
clay which contains granite and other Highland rocks. But there 
is more than presumption. Mr Peach having indicated where 
pyrites balls might be found in situ , viz., at Campsie and Kilsyth, 
I went to Campsie last week, and on inquiry was shown some thin 
strata of coal, abounding in nodules of pyrites, several of the nodules 
so large as to weigh half a cwt. The coal is worked for burning 
limestone. It is too full of sulphur for domestic use. Specimens of 
this coal, with the pyrites nodules which I obtained on the spot, 
are now on the table of the Society. 
Kilsyth I did not visit, because the overseer at Campsie 
told me that he had worked at Kilsyth, and that there were pyrites 
nodules in the coal strata there, similar to those at Campsie, but 
of rather smaller size. 
Some of the nodules which I obtained at Campsie I submitted to 
Professor Crum Brown, that he might examine them to see whether 
they contained “ marcasite.” He has reported to me as follows : — 
“ These nodules have a specific gravity of 4T2, and consist of 
iron, sulphur, and coaly matter in the following proportions : — - 
