The Structure of Scientific Evolutions

Sciences normally begin in a state of naive induction: they tend first of all to take the phenomena they are supposed to interpret as data. Thus physics began by taking the immediate sensations of experience, classified as hot, cold, moist, and dry, as fundamental principles. Eventually physics turned inside out, and discovered that its real function was rather to explain what heat and moisture were. History began as chronicle; but the difference between the old chronicler and the modern historian is that to the chronicler the events he recorded were also the structure of his history, whereas the historian sees these events as historical phenomena, to be connected within a conceptual framework not only broader but different in shape from them. Similarly each modern science has had to take what Bacon calls (though in another context) an inductive leap, occupying a new vantage ground from which it can see its former data as new things to be explained. As long as astronomers regarded the movements of heavenly bodies as the structure of astronomy, they naturally regarded their own point of view as fixed. Once they thought of movement as itself explicable, a mathematical theory of movement became the conceptual framework, and so the way was cleared for the heliocentric solar system and the law of gravitation. As long as biology thought of animal and vegetable forms of life as constituting its subject, the different branches of biology were largely efforts of cataloguing. As soon as it was the existence of forms of life themselves that had to be explained, the theory of evolution and the conceptions of protoplasm and the cell poured into biology and completely revitalized it…

… The first postulate of this inductive leap is the same as that of any science: the assumption of total coherence. Simple as this assumption appears, it takes a long time for a science to discover that it is in fact a totally intelligible body of knowledge. Until it makes this discovery, it has not been born as an individual science but remains an embryo within the body of some other subject.

— Northrup Frye