The torpedo inhabits the Mediterranean and the North Seas, and grows to the weight of twenty pounds This fish possesses a strong electrical power, and is capable of giving a very considerable shock through a number of persons forming a communication with it. This power was known to the ancients, but exaggerated by them with all the fables natural to ignorance; and it is only recently that the power has been ascertained to be truly electric. It is conducted by the same substances as electricity, and intercepted by the same. In a minute and a half, no fewer than fifty shocks have been received from this animal, when insulated. The shocks delivered by it in air, are nearly four times as strong as those received from it in water. This power appears to be always voluntarily exercised by the torpedo, which oc casionally may be touched and handled without its causing the slightest agitation. When the fish is irritated, however this quality is exercised with proportional effect to the degree of irritation; and its exercise is stated, in every instance, to be accompanied by a depression of the eyes. When that animal exerts the benumbing power, from which it derives its name, and when it operates by separate and repeated efforts, this is always the case. Both in the continued, and in the instan-taneous process, the eyes, which are at other times prominent, are withdrawn into their sockets; a circumstance very naturally attaching both to the condensation and discharge of the subtle fluid. Specimens have been known of this fish weigh ing fifty, and even eighty pounds. It commonly lies in forty fathoms of water, and is supposed to stupify its prey by this extraordinary faculty. It is sometimes nearly imbedded in the sands of shallows; and it is stated, in these cases, to give to any who happens to tread upon it, an astonishing and overwhelming shock. On dissection, it was found to exhibit no material difference from the general structure of the ray, excepting with respect to the electric or galvanic organs, which have been minutely examined and detailed by the celebrated anatomist, John Hunter: he states them "to be placed on each side of the cranium and gills, reaching thence to each great fin, and extending longitudinally from the anterior extremity of the animal, to the transverse cartilage which divides the thorax from the abdomen."

From the whole description, it appears that these organs, as Mr. Shaw observes, constitute a pair of galvanic batteries, disposed in the form of perpendicular hexagonal columns; while, in the gymnotus electricus, the galvanic battery is disposed lengthwise on the lower part of the animal. It is stated, that the torpedo, in its dying state, communicates shocks in more than usually rapid succession, but in proportional weakness; and in seven minutes, in these circumstances, three hundred and sixty small shocks were distinctly felt. On the same authority (that of Spallanzani) it is reported, that the young torpedo can exercise this power at the moment after its birth, and even possesses it while a foetus, several of these having been taken from the parent fish, and being found to communicate perceivable shocks, which, however, were most distinctly felt when these animals were insulated on a plate of glass.