alleged antipathy to magnet, [2], [7], [109], [143].
experiments upon, [143].
Diego Alfonso, [178].
Differences between electricks and magneticks, [47], [60], [65].
Dioscorides, [1], [2], [9], [32].
dip, the, also called declination, [8], [46], [184]-[204].
dipping-needle, or declination instrument, [185], [203].
direction, or directive force, [41], [46], [115], [119].
dividing a loadstone, [16], [72], [100], [121], [122], [127], [130], [136], [145], [146].