A complex of transformations, carried into effect with varying tempos since the beginning of the era of industrial revolutions, has disrupted a certain number of human societies: societies which the ethnologists often call “modern” in opposing them to those labeled “traditional.”.

It seems impossible to foresee man's future. However, we do see clearly that the past determines our present in many realms : language, concept of the world, religion, science, law. Moreover, certain biological and physiological conditions appear to be so characteristic of the human species that we would not really be concerned with humanity if men managed to free themselves of these conditions.