  For Husserl, then, phenomenology integrates a kind of psychology with a kind of logic. It develops a descriptive or analytic psychology in that it describes and analyzes types of subjective mental activity or experience, in short, acts of consciousness. Yet it develops a kind of logic—a theory of meaning (today we say logical  semantics)—in that it describes and analyzes objective contents of consciousness: ideas, concepts, images, propositions, in short, ideal meanings of various types that serve as intentional contents, or noematic meanings, of various types of experience. These contents are shareable by different acts of consciousness, and in that sense they are objective, ideal meanings. Following Bolzano (and to some extent the platonistic logician Hermann Lotze), Husserl opposed any reduction of logic or mathematics or science to mere psychology, to how people happen to think, and in the same spirit he distinguished phenomenology from mere psychology. For Husserl, phenomenology would study consciousness without reducing the objective and shareable meanings that inhabit experience to merely subjective happenstances. Ideal meaning would be the engine of intentionality in acts of consciousness.