A sure way to determine whether the notion is individual or general is to attempt to divide it into its kinds. Only general notions may be subdivided. =5. KNOWLEDGE AND IDEA AS RELATED TO THE NOTION.= Knowledge is anything known, while anything of which the mind becomes aware is a notion. Notions are always bits of knowledge, but knowledge is not always a notion. Notions are mental products belonging to the mind which thinks them, while knowledge, though it must first be a mental product of someone’s mind, may not necessarily be a product of yours or mine. Notions are always found in the mind, while knowledge may be found in books, but not necessarily in some individual mind. Knowledge stands for everything _known_, the notion, for everything _noted_. The Egyptians may have possessed much knowledge of which we may never become aware. Much of their _knowledge_ may never become _notions_ of the American people. A notion is an existing state of consciousness. Said notion may be committed to paper, and then it may give way to another notion. It now ceases to be your notion, but remains on the printed page, as a bit of knowledge. “Idea,” because of its ambiguity, really has no place in logic. The term is frequently restricted to a _reproduced percept_. To illustrate: When the pencil is before me the mental product is a percept, but when the pencil is withdrawn and I try to think of it, then have I an _idea_ of “pencil.” Probably _idea_ is most commonly associated with _meaning_ and _belief_. To illustrate: What is your _idea_ as to the meaning of homogeny? or What are your _ideas_ on the tariff? =6. THE LOGIC OF THE PSYCHOLOGICAL TERMS INVOLVED IN THE NOTION.= Concerning the knowing mind the psychologist classifies its activities and their products as follows: _Activity_ _Product_ (1) Presentative (1) Sensation Sensation (2) Perception Percept (2) Representative (1) Imagination } Image (2) Memory } (3) Thinking (1) Conception Concept (2) Judging Judgment (3) Reasoning Inference The notion as _any_ product of the knowing mind includes the _six_ products as indicated by the psychologist. The individual notion which is intuitive includes the sensation, percept and image; the general notion which is a thought product stands for the concept, judgment and inference. To put it mathematically―― { sensation } } Individual notion = { percept } = intuitive products } { image } } _notion_ { concept } } General notion = { judgment } = thought products } { inference } } As we shall have occasion frequently to refer to these psychological terms it may be well to define them. _Psychological Definition._ _Logical Definition._