Sheldon’s researches have led him to the conclusion that the most satisfactory system of classification is in terms of three types of temperament, which he calls the viscerotonic, the somatotonic and the cerebrotonic. All human beings are of mixed type. But in some the various elements are evenly mixed, while in some one element tends to predominate at the expense of the other two. In some again the mixture is well balanced, whereas in others there is a disequilibrium which results in acute internal conflict and extreme difficulty in making adaptation to life.
