The embryonic development gives us some principles to govern the further stage of infancy after birth. The stimulus in education should be found in plenty, not in want, or expressed psychologically in interest, not in distress. Life should always be made to appeal to the child as a rational whole that falls within the scope of his comprehension. A child’s activities should always reflect the intelligent character of human life as a whole. They should never spring from the necessity of adapting himself to the stem requirements of immediate necessity. The growth of the child after birth may be for convenience divided into three great parts. First comes the simple increase of the child to normal size of the adult form. The second is the development of the sexual system at the period of adolescence. The third essential fact in the development of the child is mental development, or on the physiological side, the growth of the brain co-ordination.