This paper concerns the acquisition of the English liquids 1 and r by one boy, Daniel, between August 1968 and March 1970, from the age of 1 year 6 months to 3 years 1 month. This study follows the model proposed in Stampe's "The Acquisition of Phonetic Representation," in which the child's pronunciation is derived from his mental representation of adult speech. This is done through the operation of an innate system of phonological processes. The child's successively closer approximations of adult pronunciation are interpreted as reflecting his limitations or suppressions of those processes which are not common to the adult system. The present paper outlines the main processes relevant to the acquisition of English liquids, and data are summarized to show how one particular child suppressed some of these innate processes in such a way as to arrive at a nearer approximation of the liquids used by adults in speaking English. (Author/PMP)