On the Connexion of the Physical Sciences

Waterspouts, origin and cause of, 128. Waterstone, Mr., magnetic property of the ethereal medium maintained by, 357. Waves neutralized by interference, 99. ——, atmospheric, over local districts, periods, dimensions of, 121, 122. —— of sound, 131; furnishing an illustration of reflections of sound and light, 137; interference of, producing calm, 139. Wedgwood, Dr., attempts of, to trace objects by means of light, 203, 204. Week, the, of seven days, the most ancient and universal division of time, 85. Wells, increase of temperature in, 230, 231. Welsh, Mr., observations made by, in a balloon ascent, 119. West Indies, the, cause of hurricanes in, 126. Wheels invented to test intensity of sound, 132, 133. Wheat, range of its cultivation, 250. Wheatstone, Professor, experiments in acoustics of, 132; musical instruments invented by, 143; paper on musical vibrations read by, 145; experiments on sounding boards of, 150; experiments on sound reinforced by resonance, 151; instrument measuring velocities of electricity and light invented by, 202; spectrum of an electric spark observed, 289; speed of electricity measured, 289, 290; experiments on the spectrum of Voltaic flame, 303. Willis, Mr., articulating machine invented by, 151; investigations of, into the mechanism of the larynx, 152.