 Novum Organum, I, Aphorism CXV (Bacon IV [1901], 103) ends the “pulling down” of “the signs and causes of the errors” within the sciences, achieved by means of three refutations, which constituted the condition for a rational introduction of method: refutation of ‘natural human reason’ (idols); refutation of ‘demonstrations’ (syllogisms) and refutation of ‘theories’ (traditional philosophical systems).