There are three fundamental factors in the relation of any organism to the environment and in the relation of the various parts of an organism to each other which we must now consider. To consider a living thing of any kind as something separate from the stimuli the world streams in on it, or to consider it as a real unit, is a mistake that falsifies most of the thinking of the world. On us, as living things, the universe pours in stimuli of a few kinds. Or rather there are few kinds of stimuli we are specialized to receive and react to; there may be innumerable other kinds to which we cannot react because they do not reach us. The world for us is a collection of things that we see, hear, smell, taste and feel, but there may be vast reaches of things for which we have no avenues of approach,--completely unimaginable things because our images are built upon our senses. To some of the stimuli the world pours in on us we must react properly or die. Certain "mechanisms" with which we are equipped must respond to these stimuli or the forces of the world destroy us. A lion on the horizon must awaken flight, or concealment, or the modified fight reaction of using weapons; extreme cold or heat must start up impulses and reflexes leading away from their disintegrating effects. Food must, when smelled or seen, lead us to conduct whereby we supply ourselves or we die from hunger. Dangers and needs awaken reactions, both through instinctive responses and through intelligence. The main activities of life are to be classed as "averting" and "acquiring," for if life showers us with the things we would or need to have, it also pelts us with the things we fear, hate or despise. It would be interesting to know which activities are the most numerous; presumably the lucky or successful man is busy acquiring while the unlucky or unsuccessful finds himself busiest averting. The averting activities are directed largely against the disagreeable, disgusting, dangerous and the undesired; the acquiring activities are directed toward the pleasant, the necessary, the desired. The problems of life are to know what is really good or bad for us and how to acquire the one and avert the other. While there are certain things that "naturally"[1] are deemed good or bad, there are more that are so regarded through training and education. Morality and Taste are alike concerned with bringing about attitudes that will determine the "right" response to the stimuli of the world. [1] I place in quotations NATURALLY because it is difficult to know what is "natural" and what is cultural. In the widest sense everything is natural; in the narrowest very few things are natural. Cooked food, clothing, houses, marriages, education, etc., are not found in a state of nature, any more than clocks and plays by Ibsen are. Our judgment as to what is good and bad is mainly instinctive leaning directed or smothered by education.