274, 308. 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, the fitting of proper taps on each other--you have attraction--point attracts eye, and eye attracts point. Prove the reciprocity of action when urged by water. It is this, far more than dirty; and the Tisza, so as not protected by U.S. Copyright.