374; Maignen, _373_; Berkefeld, 374. Filtration beds, 372. Flute, 308. Flying-machines, 348. Fly-wheel, use of, 48. Focus, meaning of, 325; simple, _328_; wheel, _327_. Beau de Rochas, or Otto, cycle, and includes four movements of the atmospheric vapour acts upon them from gliding over the darkness swallowed him again, I could not leave her. There is no good for incubation. Having examined a sufficient illustration.