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The charming island of Rock Island, three miles long and half a mile wide, belongs to the United States, and the Government has turned it into a wonderful park, enhancing its natural attractions by art, and threading its fine forests with many miles of drives. Near the center of the island one catches glimpses, through the trees, of ten vast stone four-story buildings, each of which covers an acre of ground. These are the Government workshops; for the Rock Island establishment is a national armory and arsenal.