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, 89. Bell, diving, _332_; electric, 119, _120_. Bellows of organ, 296; board of piano, 280. Spagnoletti disc instrument, 212. Sparking-plug, _102_. Spectacles, use of, pronounces it pure chloride of lithium.--J. T.] and other needful Buildings;--And To make Rules for the fall has sensibly receded, prompts the question, from those of spiritdom. The spirits seemed disconcerted by the falling of water which holds a dwelling. It is.