The whole of what man individually or collectively puts forth, as the product of his mind or of all minds, is the totality of _Expression_, in a sense which exactly counterparts the totality of _Impression_. Impression is related to Nature, external to man, and acting on him. Expression has relation to Art, externalized from within man, and taken in that large sense which means all human performance whatsoever. Science is _systematized knowing_, and is a middle term, or stands and functionates mediatorially between Impression or Nature and Expression or Art. Nature or the external world impresses itself upon mind, primarily, through the Senses, and predominantly stands related with the sense of Feeling, of which all the other special senses are merely modified forms or differentiations. Feeling as a sense (the sense of Touch), is allied again with Affection, the internal counterpart of the mere external sensation, as testified to etymologically by the use of the same word to express both; namely, Feeling as the synonyme of Touch, and Feeling as the synonyme of Affection. _Conation_, from the Latin _conari_, TO EXERT ONESELF, TO PUT FORTH EFFORT, is the term employed by metaphysicians to signify both _Desire_ and _Will_, the last being the determination of the mind which results in action. Conation is therefore related to action, which is again _Expression_, and is also Art, in the large definition of the term above given. The grand primary distribution of the Mind made by Kant, followed by Sir William Hamilton, and now concurred in by the students of the mind generally, is into: 1. FEELING; 2. KNOWING; and 3. CONATION (or Will and Desire). In accordance with this is Comte's famous epitome of the business of life: AGIR PAR AFFECTION, ET PENSER POUR AGIR; the three terms here being again, 1. Affection (or Feeling); 2. Knowledge (or Reflection); and 3. Action (or Performance). If now, instead of distributing the Mind, we enlarge the sphere of our thinking, and distribute upon the same principle the total Universe (_as if it_ were a mind or a mirror of the mind), for Feeling or Affection we shall put Impression or Nature; for Knowing or Reflection we shall put Science or Systematized Knowledge; and for Conation or Action we shall put Art. The following table will exhibit the two series of distribution, that of the Universe at large, and that of the Human Mind, in their parallelism, reading the two columns from below upward: I. _Universe_. II. _Mind_. 3. ART (_or Expression_). 3. CONATION (or Will and Desire). 2. SCIENCE. 2. KNOWING. 1. NATURE (_or Impression_). 1. FEELING (_or Affection_).