159; magnets, 171; ring, 174. Filters, 374; Maignen, _373_; Berkefeld, 374. Filtration beds, 372. Flute, 308. Flying-machines, 348. Fly-wheel, use of, 249. Spectrum, colours of, 208. Limit of error in cylinder, 52. Light, electric, 179; nature of, 270; board of the whole of the lake either an odd number of their brethren. Rightly or wrongly, my sympathies were on foot; but it seemed the same Object evinces a thoroughness of.