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Show the periodic appearance of comets. He inferred from his computations computa-tions that the comets of 1851, 1607 and 1682 were really the same comet periodically returning, and he predicted its reappearance in 1758. HU prediction was verified by its appearance on Christmas day of that year. This comet has since been known by his name, and regularly appears about on time, but as it requires about seventy-six seventy-six years to complete its orbit, very few of us will see it again. "Most likely this comet was a much grander sight in 1531 than it will appear to us, for it seems that when comets are made mem. bers of our solar system they become mortal, and, in astronomical measurements, their lives are short. As they repeat their journeys around the sun their tails gradually grow fainter, the nucleus slowly fades into the coma, and in the course of a few centuries or a few thousand years, perhaps, there is nothing left but the coma, which itself then gradually grows dimmer and more dim to the most powerful power-ful telescopes, and at last is no more another ghost, perchance keeping keep-ing endless vigil 'mongst the stars." COMET PARTIES IN EARLY MORNING. Have you seen the comet? Every morning, while there is a promise of a clear sky, the streets in the residential districts of Ogden are dotted with white objects and closer scrutiny will disclose dis-close the fact that these spectral bodies are not apparitions or ghostly ghost-ly wanderers, but members of "comet parties," today the most popular popu-lar of entertainments, attended by real live people who, hastily attired, at-tired, have neglected some of the formality of preparing for the events or have dressed in the most approved style of dishabille which gives to them a deceptive appearance. i A trainman, coming home in early morning and dodging past a white object, thought he was "seeing things," but when he discovered discov-ered a spectral army he came to the conclusion that Ogden had become be-come possessed of a new fad which required an exhibition of night robes. Later he learned the real meaning of it all when he reached home and found his own family out in the street and was .informed that they were viewing Halley's comet. The comet comes up above, the -Wasatch range of mountains, almost due east of Ogden, tail first, the. first sign of which is visible at about 3:15 a. m., but it is almost 4 o'clock before the head of the Celestial wanderer is in sight, but somewhat bedimmed by the rising Eun. An authority says that comets the name meaning hair are still somewhat enveloped in mystery. It has been affirmed that the heavenly space is as full of comets as the sea is of fishes. Only the brightest of these, however, are visible without the use of a good telescope. These easily visible ones differ little from one another in general appearance and consist of three parts the nucleus, the coma and the tail. The nucleus is the bright, starlike tip; the coma appears as a bit of luminous vapor surrounding the nucleus; while the tail trails away from the coma, always in a direction away from the sun, and gradually fades away into the sky, like long hair blown out in the' wind. "The nucleus, the densest and most luminous part, is believed to be gaseous, and more distant stars may be easily seen through it with good telescopes. The great comet of 1680 was computed by Sir Isaac Newton to be exposed, when nearest the sun, to a heat 2,000 times the temperature of red-hot iron a temperature sufficient to turn to gas any substance known to man, 'One of the most remarkable periodic comets we are acquainted with, and the only one visible to the unaided eye, is Halley's comet. This will be visible in the eastern morning sky during tlie latter part of May, passing the sun on May 19. It then may be seen i in the western sky immediately after sunset, probably a gorgeous object easily seen without a telescope. It will disappear about May 25. "It was Edmund Halley, an English astronomer, who first noted |