Note 65 — APPENDIX.

Pouillet suggests that when the passage of a ray of light through glass, is influenced by a powerful magnet, agreeably to the experiments of Farraday, “consistently with the undulatory theory of light, it is the ether of the body submitted to the experiment, which would be modified by the magnetism, and that it would be very difficult to recognise whether it is modified without any participation of the ponderable matter with which it is so intimately connected.” Thus the existence of matter, composed of ethereal as well as ponderable particles, is sustained by all the evidence which has been brought to uphold the undulatory theory of light.—L. & E. Phil. Mag. &c., for 1846, vol. xxviii., page 335.