Because of the tentative nature of linguistic theories, the lack of proof that linguistics is an efficacious approach to language study, and the prescriptive nature of many of the books themselves, a textbook series based on linguistics is not recommended for use in the classroom. True linguists suggest theories about the structure of language and the way in which grammar is acquired, internalized, and used, but have as yet shown little interest in educational matters. Although there is opportunity, on the other hand, for educational research to be built on the insights of transformational grammar, educators have neglected research and precipitately become concerned with linguistics in the curriculum. "The Roberts English Series" specifically fails, except in trivial ways, to relate reading and writing with grammar study, to suggest stimulating assignments, and to recognize the worth of the teacher. Rather than using such textbooks which set out new and inaccurate rules to replace the old rules, teachers in secondary schools should lead classes in the collection of language data and the formation of tentative generalizations. (JS)