[Magnet], history of the, [94];
variation of, [94];
lines of no variation, [95].
Magnetic curves, charts of, [100].
Magnetic pole, [95].
Maiollo, map of America (1527), [94], [219], [220].
Major, R. H., Select Letters of Columbus, [10], [47];
Conquest of the Canaries, [36];