[A] James (Psychology, 1890, II. p. 449) asserts that emotions follow and do not precede the bodily state. We fear because we run away, reverence because we kneel, love because we kiss. [B] The tendency of the mind is to project in imagination upon the world about us what we possess in our own souls. An accentuated mental attitude in an individual is, as a rule, proof that in its subconsciousness dwells a type of reversed feeling to the one that is active in consciousness. The excessive prude is generally at heart a sensualist. PART II. EVOLUTION OF SEX CHAPTER I ORGANIC EVOLUTION The emotion of love, like any other psychic trait, is subject to the laws of evolution. Its history is written on the pages of Life’s book. The amatory emotions have followed step by step the evolution of plant and animal. The fact of organic evolution is nowadays tacitly accepted even by those powers who in a not very remote period fought against the theory of the heliocentric system. What is still _sub judice_ is the method of evolution. Here we have two main theories: 1. The mechanistic. (a) Neo-Lamarckians. (b) Neo-Darwinians. 2. The vitalistic. (a) Teleology. (b) Creative evolution. According to the mechanistic theory, all life can be accounted for through the application of the laws of physics and chemistry, while the claim of the vitalistic theory is that physics and chemistry do not explain all. Teleology holds that life is carrying out a prearranged plan; creative evolution postulates a blind primordial energy, a psychic force, a life impetus, without any prearranged plans. The Neo-Lamarckians hold that acquired characteristics during the lifetime of the individual are transmitted to its offspring. This transmission is the method of evolution. The Neo-Darwinians deny the transmission of acquired characteristics and claim that evolution has been and is effected by natural selection. The animal’s germ-cells being a product of its own soma-cells and the parents’ germ-cells, they must change continually, since the soma-cells are being continually changed. Those germ-cells which are beneficial to the organism are selected by nature for preservation. The claim of the Lamarckians is that environment gives rise to variation, while the Darwinians maintain that a given variation is selected by environment for survival.