ACCORDING to the definition proposed in the last chapter, the term Personality signifies the total mental and bodily constitution of a human being, at all stages of development, both in relation to himself and to his environment. In setting out to study Personality as a whole, it is essential to formulate a definite concept as to the relationship of Body and Mind. Many theories have been advanced to this end, but an attempt to prove the truth of the particular hypothesis adopted is beyond the scope of a work such as this. Indeed it is a task which is as futile as it is difficult. In Chapter X there will be occasion to notice in what different ways individuals react in their thoughts and feelings to events, theories and objects; and how impossible it is for those of different types to appreciate each other’s point of view. Moreover, we must recognize that there is considerable variation in such reactions, even in the same individual, at different periods of life. Such being the case, it is inevitable that there must be differences in the way in which the relationship of Body and Mind appeals to the various types of persons.