Major questions have arisen concerning the function of play in the development of the young child. Changing attitudes towards the significance of play reflect changing social patterns. The present study was concerned with the effect that a removal of a specified amount of play material had on the play behavior of young children. Ten intact groups of children from the Washington, D.C. Metropolitan Area ranging in age from three to five years old were studied by this researcher. A time sampling technique using a modified version of DUSOPAC was used to measure the play behavior of the groups. The data collected by the observers were compiled and analysed using a one way ANOVA for a repeated measure design for each of the eleven variables (Disruptive, Unoccupied, Solitary, Onlooker, Parallel, Associative, Cooperative, Not Play, Child-Child, Child-Adult, Child-Self.) The findings indicated that a significant relationship (at the .05 significance level) existed between the amount of social play observed and the amount of play equipment that was available to the young child. Less social play was observed when the material was removed on the first treatment day than when the material was present. No significant relationships were observed between the amount of equipment available and the amount of non-social play, the amount of child-child interaction, the amount of child-self interaction, or the amount of child-adult interaction that occurred. Investigation of the mean score values revealed trends for both interaction patterns and play behavior. Females were found to display more child-self interaction behavior and males more child-child interaction behavior. Also, for all days of observation, regardless of treatment, the most frequently occurring interaction behavior was child-child followed by child-self. The least frequently occurring interaction behavior was child-adult. For play behavior for all days of observation, regardless of treatment, males displayed more disruptive, unoccupied, associative, cooperative, parallel and social play behavior than did females. Females were found to display more solitary, onlooker, not-play and non-social play behavior than were males. These findings were not in agreement with Langlois, Gottfried and Seay (1973), and Sitzky, Haywood and Isett (1970 ). The results of this study seem to indicate that there is a need for more research to 1) update earlier studies; 2) study the role of play in the development of social interactions; 3) investigate saturation levels of equipment as they relate to a child's play; 4) to explore in more detail environmental influences on play behavior.