HAVING seen the wide range of individual variation within the limits of normality, we come to the question: What is the essential characteristic of the normal personality? The answer has already been suggested. It was given in the wisdom of the ancients, and has been made familiar by folk thought, and emphasized and illustrated in the history of biological development. It is expressed in the most fundamental term in modern hygiene, as wholeness, wholesomeness, integration. To-day this conception needs not demonstration but illustration. We may begin with biology. 26 Integration.-The importance of integration in all biological and mental development is emphasized. Even intelligence itself, as studies in genetic psychology indicate, is largely a matter of integration. The biologists find that the progress of intelligence among the vertebrates runs parallel with the development of association paths in the nervous system. Still lower in the stage of development, some vague beginnings of intelligence are deemed possible by certain neurologists. Pieron 87 says:Even among the invertebrates we can discover in the higher species, especially the Cephalopoda and social Hymenoptera, important nervous areas that serve neither for reception nor motor incitation, that is to say, projection, nor even as simple synapses; and these, being situated at a higher level and replete
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