The sensation } The percept } Individual notions. The image } The concept } The judgment } General notions. The inference } Terms defined. (7) Thought and the Sensation and Percept. (8) Evolution and the Thinking Mind. (9) The Concept as a Thought Product. (10) The Judgment as a Thought Product. The simplest form of thinking. (11) Inference as a Thought Product. (12) Thinking and Apprehension. (13) Stages in Thinking. Discrimination. Comparison. Integration. (Denomination.) =15. SUMMARY.= (1) Knowing is a broader term than thinking as the former equals the latter plus intuition. (2) Intuitive knowledge is that which comes to the mind immediately by direct observation. Although intuitive knowledge comes to the mind without thought, yet such knowledge is _essential_ to all thinking. Intuitive knowledge is the foundation upon which the thinking mind builds. (3) Thinking is the deliberative process of affirming and denying connections. Thinking is a “thickening process,” the smaller units being pressed together to make a larger. Thinking is chiefly a matter of reducing plurality to unity. (4) A notion is any product of the knowing mind. An individual notion is the notion of one thing. A general notion is a notion of a class of things. A thing includes objects, qualities, relations or any existing entity. A thing is that which has _individual existence_. (5) A bit of knowledge must have been a notion of some one’s mind, but may not necessarily be a notion of _your_ mind. Knowledge may be found in books, but a notion is a mental product found only in the mind. Idea is ambiguous, though its meaning is usually restricted to an image, a meaning or a belief. (6) The products of the knowing mind are the sensation, the image, percept, concept, judgment, inference. The sensation, image and percept are individual notions, while the concept, judgment and inference are general notions. A sensation is a vague, unlocalized product of the knowing mind. A percept is a consciously localized group of sensations. An image is a reproduced percept. A concept is a mental product arising from thinking many notions into one class. A judgment is a mental product arising from conjoining and disjoining notions. An inference is a judgment derived from antecedent judgments. The developed thought processes are the concept, the judgment and the inference. (7) Just where the simplest form of thinking appears in the various activities of the knowing mind is still an undecided question. It is agreed that thinking in its developed and more complex form is found in conception, judging and reasoning. (8) Thinking evolves from the simple to the more complex, just as life has evolved.