304 
MR. A. W. RUCKER AND DR. T E. THORPE ON A MAGNETIC 
North-Western England, North Wales, and Galloway. 
The stations in this group are bounded on the west by the northern part of the 
Irish Sea. They are few in number, and so large a portion of the intervening spaces 
is covered with water that we cannot hope to unravel the intricacies of the district. 
Fig. 27. 
The valley line which bounds it on the east has been drawn through the centre of 
the region of low Vertical Force whicli exists there (see Plate XI.). The southern 
part is obtained from the Horizontal Force disturbances (see Plate X.). 
