But by this method neither Bacon himself nor anyone else has ever made any real contribution to science. It does not follow that, because all observed cases under certain conditions produce a particular effect, every other instance not yet observed will necessarily have the same effect. The true method of induction, which was evident even in the work of Kepler, and came to be more so in the discoveries of Harvey and Newton, stresses rather the part played by scientific imagination, as it is manifested by men of genius in the forming of an hypothesis. The modern procedure is as follows:--When certain effects are observed, of which the cause or law is unknown, the scientist frames an hypothesis (i. e., makes a conjecture) to account for them; then he tests this hypothesis, by collecting facts and comparing with these facts the conclusions to which his hypothesis would lead; and, if they correspond or agree, he holds that his hypothesis has been confirmed or verified, and maintains that he has discovered the cause or law. Nevertheless, while Bacon did not formulate the inductive method of modern science, he largely helped to rid the times of an unwise dependence upon _a priori_ reasoning, and he did call attention to the necessity of careful observation and experimentation, and thus opened the way for real inductive procedure. Probably no book ever made a greater revolution in modes of thinking or overthrew more prejudices than Bacon’s _Novum Organum_. [Sidenote: Bacon was not especially interested in education,] [Sidenote: but his suggestions influenced Ratich and Comenius.]