This study examined (1) the level of symbolic capability as revealed in play, (2) the use of spontaneous vocal imitation, and (3) the nature of certain classes of words occurring in spontaneous infant language. Facets of child behavior were examined during the period of single-word utterances and early multiword combinations with a view to elucidating certain cognitive aspects of early language. The temporal sequencing of development in these areas was analyzed and compared in five females aged 14-19 months. The infants, observed monthly in the home for 40-minute periods over a 1-year span, were presented with a standard set of toys and engaged in free play and conversation with their mothers. These sessions were videotaped, and language and play were analyzed. Study findings indicated consistent patterns of vocal imitative behavior and symbolic development. Symbolic play level was predictive of linguistic behavior. The use of language to code precursors of operational intelligence was remarkably consistent for all children observed. It is suggested that cognitive skills developed during the sensorimotor period form the foundation for these patterns of development. (CS)