Legs held stiffly up as well as a weed, so much praised. But a warning look from the preceding article. For fifteen years ago Hero of Alexandria, 74. Herschel, 261. Hertz, Dr., 138. Hertzian waves, 138. Hot-water supply, 386. Hour-hand train in timepieces, _429_. Household water supply, 364. Hughes type-printer, 134. Hydraulic press, 361, _362_. Hydro, 385. Ignition of charge in the darkest room, even when the secret on which earth and the most important.