The action of lightning is instantaneous, and when near by the report is at first a single sharp crack; but it is always followed by a long rolling, so characteristic that every name given the thunder in a measure endeavors to imitate it. The reason of the continued roll from a single flash is simple, and is to be found in the fact that a flash usually travels several miles; and as sound travels as stated above, the sounds generated at different distances come to the ear in rapid succession, resulting in a continuous roar.

As the flash is due merely to the attraction between two bodies charged with opposite kinds of electricity, the discharge may pass either up or down. Cases are on record of persons on a mountain side being killed by lightning from a cloud below them, and of people on the ground killed by lightning dashing from them toward the sky.

Among the more notable fatalities resulting from lightning may be mentioned the terrible thunder storm of 1793, at Buenos Ayres, when the lightning struck thirty-seven times within the city, and killed nineteen people. A number of persons were killed on June 18, 1872, in England, at different places; and numerous others perished within the month from similar discharges.

Electricity seems to kill by destroying nervous power. Cardanus tells of eight reapers being killed while taking their meal under an oak. When the witnesses of the occurrence ran to the spot, they saw a strange sight. The victims “seemed to be still busy with their frugal repast. One of them held his glass, another was putting some bread into his mouth, a third had his hand in the dish. The angel of death had struck them so violently that the whole surface of their bodies bore the marks of his black wings. They seemed so many statues sculptured in black marble.”

“In another case where ten reapers were killed under a hedge, one of them had a dog on his knee at the time when he was struck. The unfortunate man was caressing with one hand his little companion, and with the other giving him a piece of bread. Both master and dog were merely inert masses of rigid muscle and stiffened sinew, and yet the bread was still held by the lifeless hand. The dog, with his mouth expressively open, seemed still to beg for the proffered morsel.”

A peasant woman in the suburbs of Nancy was struck while gathering flowers. She was found standing, holding in her hand the daisy she had been plucking. A French soldier took refuge under a tree during a storm; a peasant sheltered himself in a copse near by. The soldier was killed by lightning. The storm over, the peasant crept out and called to the soldier to come on. Receiving no answer, he