In this case we are set thinking of electro-metallurgy, all the more because there are a number of other instances which certainly belong to this category. Thus, for instance, on July 25, 1868, at Nantes, a stranger near the Pont de l'Erdre, on the Quai Flesselles, was enveloped by a flash of lightning, but proceeded on his way without experiencing any ill effects. He had on him a purse containing two pieces of silver in one compartment and a ten-franc piece in gold in another. On taking out his purse he found that a coating of silver taken from one of the silver pieces--a franc--had been transferred to both sides of the ten-franc piece. The franc, slightly thinner, especially over the moustache of Napoleon III., was in parts slightly bluish. This transference of the silver on to gold was made through the skin of the partition of the compartments![1] Another case. In Gilbert's "Annalen der Physik" (1817) we read that a flash of lightning struck the tower of a chapel near Dresden and took the gilt off the framework of the clock and transferred it to the leaden runs of the window-panes in such a way as to leave no sign of how these had been gilded. In these cases the analogy with galvano electro-metallurgy is evident. But in the earlier cases this was not so; the trees contained no metallic element. It was not a case of transference. They seem to have been photographed by the ceraunic rays. On October 9, 1836, a young man was killed by lightning. The corpse bore in the middle of the right shoulder six rings of flesh-colour, which seemed the more distinct in that the rest of the man's own skin was very dark. These rings, overlapping each other, were of different sizes, corresponding exactly with those of the gold coins which he had on him on the right side of his belt, as the public official who examined his body and all the witnesses were able to testify. This makes us think of radiography. A correspondent of Poey, the astronomer, told him that he had known a Trinidad lady who had been struck by lightning in her youth and on whose stomach the lightning had imprinted a metallic comb which she carried in her apron. In these instances there was some kind of contact of the objects with the persons struck. Here are others in which the objects reproduced are further removed, but still of metallic substance and still reminding us therefore of electro-metallurgy. In September, 1825, the brigantine _Le Buon-Servo_, at anchor in the Bay of Armiro, was struck by lightning. A sailor seated at the foot of the mizzen-mast was killed. On his back was found a light yellow and black mark, beginning at his neck and going down to his loins, where there was discovered an exact reproduction, in facsimile, of a horseshoe nailed to the mast.