Whoever wishes to acquire a deep acquaintance with Nature must observe that there are analogies which connect whole branches of science in a parallel manner, and enable us to infer of one class of phenomena what we know of another. It has thus happened on several occasions that the discovery of an unsuspected analogy between two branches of knowledge has been the starting point for a rapid course of discovery.
William Stanley Jevons (1874). “The Principles of Science: Book IV. Inductive investigation. Book V. Generalization, analogy, and classification. Book VI. Reflections on the results and limits of scientific method”, p.288
