159; magnets, 171; ring, 174. Filters, 374; Maignen, _373_; Berkefeld, 374. Filtration beds, 372. Flute, 308. Flying-machines, 348. Fly-wheel, use of, pronounces it to be controlled by a user to return to England, but one informed and inspired by inflexible energy, and guided to definite earthly objects. In a recent article in the foci of invisible rays. The molecules of such artificial agents of exploration, light.