The name given to a subtle agent called the electric fluid, latent in all bodies, and first evolved by friction, and which may manifest itself, under certain conditions, in brilliant flashes of light, or, when in contact with animals, in nervous shocks more or less violent. It is of two kinds, negative and positive, and as such exhibits itself in the polarity of the magnet, when it is called Magnetic (q. v .), and is excited by chemical action, when it is called Voltaic ( q. v .).