Over the last few decades the biological sciences have developed a strong new branch which lays down certain important prerequisites for any conception of human nature. This is the science of behavior which has found a place half-way between its sister sciences, morphology and physiology, who are often very far apart from one another. The new science has given some of its representatives the will to try out new conceptions of the organism. “Behavior” combines structure and function in a new whole, and it promises to overcome the separation between individual and environment, for a larger synthesis brings more comprehensive phenomena into view. It also promises to overcome the isolation of the individual, for it makes it possible to comprehend the individual as an integral part of a whole which is of necessity supra-individual.