Philolaus, [214].

Philostratus, [111].

Pictorio, G., [6], [49].

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].