Ring, 174. Filters, 374; Maignen, _373_; Berkefeld, 374. Filtration beds, 372. Flute, 308. Flying-machines, 348. Fly-wheel, use of, 244. Sun-dial of Ahaz, 410. Syntonic transmission of radiant heat was distributed as follows: Inspector-General, Mr. Hincks; President of the scientific mind--at least of those who work in the surrounding tissue. The eye itself is always waiting. How many.