378 Mr. Christie on the magnetism of 
purpose of illustration ; they are contained in the following 
Table. The numbers in the first column indicate the points 
on the plate which coincided with the line joining the centres 
of the plate and needle, when the several observations of 
the directions of the north end of the needle were made. Of 
the letters at the tops of the columns, the upper ones indicate 
the direction of rotation of the south; or upper edge of the 
plate, with respect to the points in the horizon ; and the 
lower ones, the direction of the inner edge, or that nearest the 
axis, with regard to the poles of the sphere ; the letters at 
the bottoms of the columns indicate the direction of the devi^ 
ation of the south end of the needle due to rotation. 
