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Updated: September 8, 2025
There stood the city, a great fact, and even that afternoon as the wild autumn wind blew from the west and rapid, ragged cloud masses passed huge shadows over the ship-swept Hudson, darkened briefly the hurrying streets, extinguished for a moment the glitter of a skyscraper and went gray-footed over the flats of Long Island, even at that moment terrific forces, fierce aggregations of man-power, gigantic blasts of tamed electricity, gravitation, fire, and steam and steel, made the hidden life of the city cyclonic.
Lord Rayleigh also obtained the same results with a film of a solution of soap and glycerine, but in this case the dark portion was observed at the top of the spectrum, the other colors arranging themselves in order in the soap film thinned by the force of gravitation, thus showing that the colors vary according to the thickness of the film.
Having now traced the progress of physical astronomy up to the time when very striking proofs of the universality of the law of gravitation convinced the most sceptical, it must still be borne in mind that, while gravitation is certainly the principal force governing the motions of the heavenly bodies, there may yet be a resisting medium in space, and there may be electric and magnetic forces to deal with.
But it was reserved for him to accomplish other discoveries, which have pushed even his analysis of the sunbeam into the background; it is he who has expounded the system of the universe by the discovery of the law of universal gravitation. The age had indeed become ripe for the advent of the genius of Newton.
All conditions, then, were favorable to the sliding of the rock, and, in obedience to the laws of gravitation, it precipitated itself into the valley as soon as its adhesion to the earth beneath it was destroyed by the conversion of the latter into a viscous paste.
In the end thus mutual gravitation led to a shock and confusion of individualities which was not without its charm; or, to put the matter more plainly, Leonard proposed to Jane and had been accepted with many blushes and some tears and kisses. It was a common little romance enough, but, like everything else with which youth and love are concerned, it had its elements of beauty.
It was this which determined astronomers to consider the law of gravitation as obtaining between all bodies whatever, and therefore between all particles of matter; their first tendency having been to regard it as a force acting only between each planet or satellite and the central body to whose system it belonged.
The book slipped from his hands to the ground, and they sat idly and silently, gazing out over the dreamy bay with eyes that dreamed and did not see. Ruth glanced sidewise at his neck. She did not lean toward him. She was drawn by some force outside of herself and stronger than gravitation, strong as destiny. It was only an inch to lean, and it was accomplished without volition on her part.
I do not compare Colonel Roosevelt with gravitation, but have all the satirical squibs against our famous contemporary, from the "Alone in Cubia" to the "Teddy-see," ever cost him, in a dozen years, a dozen votes? Very likely Mr. Lloyd and Mr. Chesterton are right. We are less censorious than our ancestors were. Americans, on the whole, try to avoid giving pain through speech.
But these movements are very complex, and it seems almost inconceivable that the same medium could possess simultaneously the state of movement corresponding to the transmission of a luminous phenomenon and that constantly imposed on it by the transmission of gravitation. Another celebrated hypothesis was devised by Lesage, of Geneva.
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