Chapter I: The Meaning of Infancy

1. The relation between progress and infancy
2. Man's method of learning
3. The mental inheritance of animals
4. Infancy and educability of animals
5. Infancy is a period of plasticity
6. Educability varies widely in different creatures
7. Increased intelligence means prolonged infancy
8. The socializing effects of infancy
9. The use of this capacity for progress in the past