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CHAP. II. We in England are well accustomed to the extension, modification, and improvement of law by a machinery which, in theory, is incapable of altering one jot or one line of existing jurisprudence. The process by which this virtual legislation is effected is not so much insensible as unacknowledged. With respect to that great portion of our legal system which is enshrined in cases and recorded in law reports, we habitually employ a double language and entertain, as it would appear, a double and inconsistent set of ideas. When a group of facts come before an English Court for adjudication, the whole course of the discussion between the judge and the advocate assumes that no question is, or can be, raised which will call for the application of any principles but old ones, or any distinctions but such as have long since been allowed. It is taken absolutely for granted that there is somewhere a rule of known law which will cover the facts of the dispute now litigated, and that, if such a rule be not discovered, it is only that the necessary patience, knowledge, or acumen is not forthcoming to detect it. Yet the moment the judgment has been rendered and reported, we slide unconsciously or unavowedly into a new language and a new train of thought. We now admit that the new decision has modified the law. The rules applicable have, to use the very inaccurate expression sometimes employed, become