Whewell was a co-founder and president of the British Association for the Advancement of Science, a fellow of the Royal Society, president of the Geological Society, and for many years Master of Trinity College, Cambridge. Whewell had a particular skill for devising new terms. He coined the words "anode," "cathode," and "ion" for Faraday and the word "scientist" in 1833 (the term, however, did not come into general use until the very end of the century). Whewell is perhaps most remembered today for his Philosophy of the Inductive Sciences (1840). In addition to his influential pronouncements on the proper way to do science, Whewell also attempted to classify the sciences (see figure). Whewell wrote that the essence of induction was "the colligation of facts by means of a concept". In other words a wide range of facts should be brought together to support a conclusion. A theory could be considered confirmed if many independent inductions from experience are unified and fit together within the theory. Whewell was a Kantian rather than an empiricist like Herschel or J.S. Mill. Whewell and Mill carried on a lively debate on these matters.