The selection of papers reprinted here traces the development of syntax from structural linguistics through transformational linguistics to operator gram mar. These three are not opposing views or independent assumptions about language. Rather, they are successive stages of investigation into the word combinations which constitue the sentences of a language in contrast to those which do not. Throughout, the goal has been to find the systemati cities of these combinations, and then to obtain each sentence in a uniform way from its parts. In structural analysis, the parts were words (simple or...