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 validity depends, he proceeds to make some remarks on the way in which the major premiss, or general statement in the syllogism, is to be obtained. He says (‘Prior Anal.’ I. xxx.): “There is the same course to be pursued in philosophy, and in every science or branch of knowledge. You must study facts. Experience alone can give you general principles on any subject. This is the case in astronomy, which is based on the observation of astronomical phenomena; and it is the case with every branch of science or art. When the facts in each branch are brought together, it will be the province of the logician to set out the demonstrations in a manner clear and fit for use. When the investigation into nature is complete, you will be able in some cases to exhibit a demonstration; in other cases you will have to say that demonstration is not attainable.” Bacon knew very little Aristotle at first hand; and he cannot have known this passage, else its overwhelming good sense must have stopped many of his remarks. And Aristotle in practice was quite true to the principles here announced. In his ‘Ethics,’ ‘Politics,’ and ‘Physics,’ he does not pedantically drag in the syllogism, but masses facts together, and makes penetrating remarks upon them, and discusses freely, by means of analogy, comparison, and intuition, very much as the ablest writers of the present day would do.

At the same time it must be admitted that, after fully explaining the deductive process, he left the theory of the inductive process, by which general laws are ascertained, almost entirely unexplored. He briefly