How do languages transmit information about the properties of phrases over large structural distances? This is the difficult question raised by the phenomenon of extraction, and while extraction has driven the development of syntactic theory for decades, there is still no consensus on what form the connectivity mechanism should take. A number of recent theoretical approaches share the view that extraction is not a unitary phenomenon, but this monograph offers data that radically undercuts this view. The grammar of extraction connectivity, the authors conclude, is relatively simple, homogenous in construction type, and uniform in the position of the extractee.