ABSTRACT
This chapter considers something of the manifold variations and deviations which arise from the interactions between the germinal basis and the developmental environments. It suggests that the influences of the surrounding elements are important factors in determining the nature and success of the final personality. The chapter also suggests that during both prenatal and postnatal development, peculiar stuffs are produced within the individual which tend to characterize its internal environment. The physical basis of the individual, the fertilized egg, has within itself the potentiality which gives rise to the completed personality. In order to develop this personality, however, a long series of interactions between the original basis and the surrounding environment is essential. The presence of exaggerated differences among human personalities has led us to an examination of normal personalities, in order to determine whether minor differences among people could be in any way classified and explained.
