Powers. It is said that this is effected by passing the air in front of the heart, 357. Veins, 358; capillary, 358; pulmonary, 361. Ventral segments, 291. Ventricles, 357. Vibration of columns of air, 291. Note, fundamental, 285; quality of, 285. Niagara Falls, power station at, 174. Organ.