24 but who were judged to be the most advanced in English,received reading instruction in English only. Students who had little English ability and who were also less fluent than the rest in Spanish received in struction in Spanish only. By the end of the school year, third-grade students who received reading instruction in both languages were achieving at the same level as those who received instruction in English only, even though they began the school year at a significantly lower level of English achievement. The relationship of language and intelligence/academic achievement The body of research on the theoretical perspective of the re lationship of language acquisition and cognitive development is reviewed by Rice (1980), who places the research findings on a continuum. At one extreme she finds language and cognition independent of each other, in the mid area there is agreement that language development is inter dependent on cognitive development, and at the opposite end that cognition is dependent on language development. She concludes that each theory seems to explain some phenomena of language acquisition, but that no one theory accounts for all the complexities of children's language performance or the relationship of language and intelligence. Language, according to Hal 1iday (1578),performs four basic functions. It interprets the entirety of human experience, expresses logical re lationships, identifies speakers and societal roles, and relates what is being said to the context of the speech event. In reviewing the work of Bernstein, Halliday finds that the process of becoming educated re quires that meaning must develop along certain lines of cultural content,