ABSTRACT
We end up with the consideration that evolution from one generation to the next most probably took place under the joint action of natural selection and organic selection in such a way that the direction of racial variations coincided with that of individual adaptations. We arrive at an hypothesis unifYing ontogeny with phylogeny in all animal series. All the influences helping animal adaptations and accommodations are combined in one resulting effect to give a determined orientation to the course of evolution. We call these orienting influences arthoplasia. (chap. 7, sect. 4, p. 41)
HAECKEL, BRUNSCHVICG, CLAPAREnE, AND DARWIN
KNOWLEDGE AND SOCIETY
10. PIAGET'S IDEAS ABOUT GENESIS AND DEVELOPMENT 249
NORMS AND NATURE
