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It is to the English schoolboy that the game of football really owes its origin. During the middle of the nineteenth century there was an athletic revival throughout England and football became the favorite pastime of the winter months in such schools as Rugby, Eton, Harrow, Charterhouse and others. The game came to its present important position through a gradual evolutionary process in which both a standard of play and of rule were developed together. In the growth of the two principal forms of modern play, "Association" and "Rugby", the size of the particular school ground was the determining factor. In 1850 the only school playground in England large enough to permit the running and tackling game was connected with Rugby.
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Fielding Harris Yost (Football for Player and Spectator (Illustrated): All you need to know about Football)