Philolaus, [214].
Philostratus, [111].
piedramant, [11].
Plancius, Peter, *[v] bis.
planets, influence of, [20], [137], [142].
plasters, magnetick, [32], [33].
Plato, [3].
in the Io, discusses name and properties of the magnet, [1], [9], [11], [18].
in the Timæus, suggests the theory of circumpulsion, [61].