"But, it may be objected with some plausibility, granted the existence in the snails of this sympathetic fluid, will it radiate from them in all directions, after the analogy of electric, galvanic and magnetic fluids, unless there be some conductor established between them? At first sight, this objection has some weight, but for all that it is more specious than serious." The solution of this difficulty is exquisitely absurd. We must summarise. At first the discoverers of the galvanic current thought it necessary to establish a return wire, to complete the circle, till it was found to be sufficient to carry the two ends of the wire in communication with the earth, when the earth itself completed the circle. There is no visible line between the ends underground, yet the current completes the circle through it. Moreover, it is impossible to think of two points without establishing, in idea, a line between them, indeed, according to Euclid's definition, a straight line is that which lies evenly between its extreme points, and a line is length without breadth or substance. So, if we conceive of two snails, we establish a line between them, an unsubstantial line, still a line along which the sympathetic current can travel. "Now MM. Benoît and Biat, by means of balloons in the atmosphere," had established beyond doubt that a visible tangible line of communication was only necessary when raised above the earth. "Consequently, there remains nothing more to be considered than the means, the apparatus, whereby the transmission of thought is effected. "This apparatus consists of a square box, in which is a Voltaic pile, of which the metallic plates, instead of being superposed, as in the pile of Volta, are disposed in order, attached in holes formed in a wheel or circular disc, that revolves about a steel axis. To these metallic plates used by Volta, MM. Benoît and Biat have substituted others in the shape of cups or circular basins, composed of zinc lined with cloth steeped in a solution of sulphate of copper maintained in place by a blade of copper riveted to the cup. At the bottom of each of these bowls, is fixed, by aid of a composition that shall be given presently, a living snail, whose sympathetic influence may unite and be woven with the galvanic current, when the wheel of the pile is set in motion and with it the snails that are adhering to it.