[ V ] 
LIST OF ILLUSTRATIONS. 
George W. Walker on the Magnetic Re-survey of the British Isles for the Epoch 
January 1, 1915. 
Plate 1.—Chart of Equal North Component. 
Plate 2.—Chart of Equal West Component. 
Plate 3.—Chart of Equal Vertical Component. 
Plate 4.—Chart of Equal Declination. 
Plate 5.—Chart of Disturbing; Eorces. 
Diagrams : figs. 1-6. 
O O 
Appendix. 
Arthur Hubert Cox : A Report on Magnetic Disturbances in Northamptonshire 
and Leicestershire and their Relations to the Geological Structure. 
Plate Ap. 1.—Irthlingborough District. 
Plate Ap. 2.—Section—Leicestershire. 
Plate Ap, 3.—^^Map—Melton and Nottingham. 
