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edition of Goff and Jones, Law of Restitution, 1966, Sweet & Maxwell, can be seen as a good example of induction as a research tool. The authors argued for a reinterpretation of a diverse range of common law and equity cases in terms of the unjust enrichment principle; in other words, this principle could be induced out of the English cases so as to act as a law capable of explaining and predicting. 3 Deduction is often seen as the reverse of induction: that is to say, it is a reasoning process by which one goes from the general to the particular. More precisely, deduction can be described as saying that certain pieces of knowledge being considered as acquired, other knowledge can be inferred as a consequence. Thus if A=B and B=C, then it can be deduced that A=C What is so valuable about deduction as a knowledge technique is that information can be acquired without recourse to empirical investigation, experience or any other exterior source (Oléron, Le raisonnement, 4th edn, 1995, PUF, pp 73–74). Thus, someone who lives far away from the UK and knows that cotton requires hot and dry conditions to grow can deduce whether or not cotton grows naturally in the UK. All that is needed is information on UK weather conditions. In law, the deductive method finds expression through the use of the syllogism (see below, p 183).
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This was a successful action for damages, against a manufacturer of underpants, for injury caused to a purchaser by a pair of underpants which had not been properly decontaminated of chemicals before leaving the factory.