624 MR. A. W. RUCKER AND DR. T. E. THORPE OK A MAGNETIC 
Cumnock would be explained if there were a locus of attraction a little to the east of 
that place. 
The minor ridge line passes near Sanquhar, and is lound further to the south near 
Lockerbie and Auldgirth. It therefore probably crosses the more important line 
indicated in this district, and the Horizontal Forces give evidence of a peak between 
Thornhill and Moffat. 
Curiously enough this ridge line—though always maintaining its secondary 
character—can be traced as a locus of maximum \ertical Disturbing Force to the 
English Lakes, where it again becomes important, and, taking this fact into account, 
we think that its existence just south of Newmilns is practically certain. 
There is also some reason to think that the ridge line which runs to A ewmilns from 
Glasgow is itself prolonged beyond the former place. The Vertical Foices at 
Penwherry and Pinvalley, in South Ayrshire, prove that a ridge line must lun just 
north of those places. There is no direct evidence that it runs to Newmilns, but it is 
in the prolongation of the Glasgow-N ewmilns line, and the direction of the 
Horizontal Disturbing Force at Loch Doon accords with the hypothesis that it 
passes near that place. 
On the whole, therefore, it appears most likely that the east and west branches of 
the ridge line curve south between Glasgow and Ardrossan, meet and produce a great 
local disturbance near Newmilns, and that the two branches, though much weakened, 
are continued into the next district. 
To the west of Arran, the ridge line evidently turns south and runs parallel to the 
valley line in Cantyre, 
District 8.— Galloway. 
We now come to the last of the Scotch Districts. It is one of the most important 
of the minor magnetic regions, and its principal characteristics have been entirely 
discovered since the publication of our earlier paper. 
Large Horizontal Disturbing Forces are one of the characteristics of the north of 
Scotland. 
We have now reached a district in which the Forces are smaller and are indeed 
often below the limit of accurate determination of direction. It is, however, very 
remarkable how well the results at such stations agree with the more trustworthy 
conclusions drawn from neighbouring places. It is, practically, only at such stations 
that difficulties of interpretation occur, but the great majority of them gPe useful 
information. A clearly marked ndg’e line runs from Elvanfoot to Newton Stevait, 
and its prolongation to the west of the latter place is proved by the equally clear 
valley line which passes through Stranraer. Elvanfoot is a maximum of A eitical 
Disturbinof Force, and is near a centre to which tend the Horizontal Disturbing Foices 
from a number of stations in the neighbourhood. 
This is interesting, because, as has been already pointed out, it is near to this point 
