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Psychoanalytic Review, 1946, Vol. XXXIII, No. 3, pp. 306–313.
The authors attempt to point out that the laws or principles of physics may with advantage be explicitly applied to psychological science. They point out further that psycho-analysis is the only
significant major school of psychology at present which uses the three following laws consistently as an integral part of its conceptual frame. (1) The Principle of Casuality. Freud was the first to use consistently this principle in the psychology of personality, that is, the doctrine of absolute determinism of psychological events. Freud's genetic viewpoint is a consistent demonstration of the law of casuality. (2) The Law of Conservation of Energy. Freud again was the first who introduced to psychology and effectively used the law of conservation of energy. He created the concept of libido as one special form of energy and concerned himself with the distribution and dynamic interchange of this special kind of energy. The libido theory is a particular form of restatement of the law of conservation of energy as applied to psychological phenomena. (3) The Biogenic Law. Freud's assumption that certain psychosexual characteristics and some aggressive tendencies must be viewed as result of phylogenesis are special cases of this law. Such hypotheses are completely acceptable according to the principles of biology. Psychology can be considered as a part of biology. Such a view does not weaken the importance of cultural factors.