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But this point of view by no means embraces the whole of the

actual process; for it slurs over the important part played by

intuition and deductive thought in the development of an exact

science. As soon as a science has emerged from its initial

stages, theoretical advances are no longer achieved merely by a

process of arrangement. Guided by empirical data, the

investigator rather develops a system of thought which, in

general, is built up logically from a small number of fundamental

assumptions, the so-called axioms. We call such a system of

thought a theory. The theory finds the justification for its

existence in the fact that it correlates a large number of single

observations, and it is just here that the "truth" of the theory

lies.