This book develops from a strong claim: namely, that style is meaningful. A textbook may not be the best place to advance a strong claim, so, to make this claim less conspicuous, I could downgrade it by describing it as in keeping with established views. I could point out that few authors of composition textbooks deny the importance of style, and most offer advice on words and sentences. And I could point out that many researchers, especially those working in English for Special Purposes, have analyzed style in the scholarly genres. In turn, these inquiries could be seen as developing the long standing sociol-inguistic idea of "register," the condition which indexes language for use in definable social settings.