... true of the definition of any term of science, is of course true of the definition of a science itself: andaccordingly, (as observed in the Introductory Chapter of this work,) the definition of ... designation neither of a thing nor of a name, but of an idea. We then have The idea of a dragon is an idea of a thing which breathes flame: The idea of a dragon is an idea of a serpent:Therefore, ... really cases of inference; and yet the trivial examples bywhich, in manuals of Logic, the rules of the syllogism are illustrated, are often of this ill-chosen kind; formaldemonstrations of conclusions...