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From a systematic theoretical point of view, we may imagine the

process of evolution of an empirical science to be a continuous

process of induction. Theories are evolved and are expressed in

short compass as statements of a large number of individual

observations in the form of empirical laws, from which the

general laws can be ascertained by comparison. Regarded in this

way, the development of a science bears some resemblance to the

compilation of a classified catalogue. It is, as it were, a

purely empirical enterprise.