SURVEY OF THE BRITISH ISLES FOR THE EPOCH JANUARY I, 1886. 
305 
At Dumfries and Carlisle the disturbing forces are small, and coincide in direction 
with the valley line, i.e., they fairly represent the resultants of two attractions 
exerted on each side of it. At Stranraer, and in the Isle of Man, our disturbiug 
Horizontal Forces act towards the south, and this result is confirmed by those 
Fig. 28. 
deduced from Welsh’s observations at Stranraer and Newton Stewart. They are 
much larger than ours, and at Dumfries the southward tendency is more marked. It 
must be remembered, however, that the calculations by which these results have been 
deduced from the 1857 survey have been conducted on the assumption that the 
mdcccxc.—A. 2 R 
