Without entering into minute details, the peculiarity of the organic apparatus of the Electrical Eel seems to consist in this, that it is composed of numerous _laminæ_ or thin tendinous partitions, between which exists an infinite number of small cells filled with a thickish gelatinous fluid. These strata and cells are supplied with nerves of unusual size, and the intensity of the electrical power is presumed to depend on the amount of nervous energy accumulated in these cells, whence it can be voluntarily discharged, just as a muscle may be voluntarily contracted. Furthermore, there are, it would appear, good reasons to believe that nervous power (in whatever it may consist) and electricity are identical. The progress of science has already shown the identity between heat, electricity, and magnetism; that heat may be concentrated into electricity, and this electricity reconverted into heat; that electric force may be converted into magnetic force, and Professor Faraday himself discovered how, by reacting back again, the magnetic force can be reconverted into the electric force, and _vice versâ_; and should the identity between electricity and nervous power be as clearly established, one of the most important and interesting problems in physiology will be solved. Every new discovery in science, and all improvements in industrial art, the principles of which are capable of being rendered in the least degree interesting, are in this Exhibition forthwith popularized, and become, as it were, public property. Every individual of the great public can at the very small cost of one shilling, claim his or her share in the property thus attractively collected, and a small amount of previous knowledge or natural intelligence will put the visitor in actual possession of treasures which previously “he wot not of,” in so amusing a manner that they will be beguiled rather than bored into his mind. A TUSCAN VINTAGE.