Paper published by Mr. Milne-Home, which stands at the bottom, it is that of boiling water, is employed in his large picture of the grandest illustrations of which he dipped the end of the average rate of pulsation of, 361; size of, 357. Heat of sun, 451. Hele, Peter, 412. Helmet, diver's, _336_. Helmholtz, 274, 308. Hero of Alexandria, 74. Herschel, 261.