Here is a fourth instance, given me long ago by one of the most learned physicists of last century, Hoin, of the Institute. "I am going to tell you," he wrote to me in July, 1866, "of a stroke of lightning which was very curious in its effects. It occurred at midday on June 27, at Bergheim, a village situated to the north of Logelbach at the foot of the Vosges. It struck two travellers who had taken refuge under the tree and knocked them over senseless--one of them was lifted to a height of more than a yard and thrown upon his back. It was thought they must be dead, but thanks to the attention given to them at once, they were brought to themselves, and they are now out of danger. But here is the strange feature of the accident. Both travellers have on their backs, extending down to their thighs, _the imprint, as though by photography, of the leaves of a lime tree_; according to the statement of the Mayor, M. Radat, _the most skilful draughtsman could not have done it better_." Here is a fifth instance which I find among my records. The incident happened at Chambéry, May 29, 1868. In the course of a violent storm, a soldier of the 47th Regiment was struck by lightning underneath a chestnut tree. In a memorandum drawn up on June 18 by a learned doctor of Chambéry, an eyewitness of the occurrence, the following facts are recorded:-- "The man who was killed had been standing in the centre of a group of eight soldiers, who had their guns in their hands, without bayonets. Struck in the region of the heart, he did not succumb for about a quarter of an hour, after saying a few words. The corpse bore an oval plate, so to speak, of about 13 to 14 centimetres in length, by 4 to 5 in width, occupying largely the precordial region, and presenting the parchment-like aspect of a vesicatory that had become rapidly dried up. The clothes were neither torn nor burnt. "Two hours after his death an examination of the body resulted in the discovery of a phenomenon already recorded by several observers--the reproduction of photo-electric pictures. "On the right shoulder were three bunches of leaves of a more or less deep reddish violet hue, reproduced minutely with the most absolute photographic precision. The first, situated on the lower part of the inside of the forearm, represented a long branch of leaves like those of a chestnut tree; the second, which seemed to be formed by two or three such branches twisted together, was in the middle of the outside of the arm; and the third, in the middle of the shoulder, larger and rounder, showed only some leaves and small branches at the top and at the borders, the centre presenting a red stain diminishing towards the circumference. The body, when dissected, bore no sign of any interior lesion." Here is a sixth instance:--