But no amount of science can rob such appearances of their terrors for the uninitiated. Of scores of instances we might name, a single one will suffice. Prof. Siemens tells of an unusual electric disturbance during a Khamsin, while his party and his Arab guides were upon the summit of the great pyramid. Hearing a hissing noise as the wind rose, he at length concluded it must be due to electricity: and “holding up a full wine-bottle, the head of which was coated with tin foil,” the same hissing was increased. The bottle was then wrapped with moist paper, to increase its capacity. Even before this, a severe shock could be obtained from the head of the bottle. “The Arabs, who for some time had been looking on with astonishment at our proceedings, came to the conclusion that we were practicing magic, and insisted upon our leaving the pyramid. Their remonstrances being of no avail, they now wanted to use the right of the stronger, and to make us descend by force. I retreated to the highest stone block and loaded my bottle as strongly as possible, while the leader of the Arabs seized me by the other hand and was endeavoring to drag me down. At this critical moment, I touched him with the neck of the bottle, and the effects of the shock it produced were such as to surpass my keenest expectations. The son of the desert, whose nerves had never before felt a similar commotion, fell flat down upon the ground, as if struck by lightning; and then springing up with a dreadful howl, soon vanished out of sight, followed by all his comrades.” These cases of halos and electric aureoles thus far mentioned, have clearly played a far more important part in the history of nations than the more frequently occurring lightning stroke, merely because of the wonderful hold they have had upon the superstitious tendency of man. Leave Servius Tullius out of the history of Rome, or leave out the speech and aureole of Marcius, and who can say how different the face of the earth might be? More frequently observed, and because of its frequency, comparatively unheeded in northern climes, is the aurora, which in the temperate zone has frequently inspired terror equal to the earthquake, though absolutely harmless. The writer recalls that a bright aurora not so very many years ago caused not a few superstitious folk to believe the end of the world was at hand. They believed the red streamers to be the chariot of fire in which the Lord was speeding earthward. This was the great aurora of September 3, 1859, which was visible from the United States to Siberia, from the Cape of Good Hope and Australia to the north of Europe. It was the most tremendous ever known, and well calculated to terrify the superstitious.[A]