Velocity of the Mississippi, vii, 174.
— of sound, vi, 394.
Velocities, virtual, principle of, xlii, 66; xliii, 77.f
Venetz, on boulders, xxxvi, 327.
Venice bead manufactory, xxvii, 78.
Ventilating sewers, furnace for, vii, 177.
Ventilation, effect of, on the mortality of infants, xxviii, 79.
Ventilator, marine, description of, S. Whiting, xviii, 75.f
Ventriloquism, remarks on, R. Tolefree, xxvi, 76.
Venus, appearances of, as seen at Rome, P. F. de Vico, xliv, 377.