Comments on the article by Parker in this issue. Reviews Parker's discussion of imitation and circular reactions, and discusses the application of Darwin's ideas about evolution to the study of the development of individuals' awareness of the world and the mind. Considers the role of blind trial and error and of selection in evolution. (BC)

Elaborates some of the ideas of Baldwin and Piaget concerning the self-teaching functions of circular reactions, or self-induced repetition of particular schemes, and imitation. Argues that these functions are means for cognitive constructions. Discusses the evolution of imitation and circular reactions in primates. (BC)

Discusses the role of play in development from both cultural-evolutionary and ontogenetic-historical perspectives. These perspectives illuminate how play and imitation are important for the developing individual who is seen as influencing a changing cultural environment. (Author/RH)