This book is a thesis submitted to the Faculty of Arts of the University of Utrecht. It was prepared under the supervision of Prof. Dr. H. Schultink. I would like to express my gratitude to him for his criticisms of earlier versions which led to many improvements, in particular with respect to the exposition of the argument. To my co-referent Dirk van Dalen, reader in the Department of Philo- sophy (, Centrale Interfaculteit') of the University of Utrecht, I am greatly indebted for his valuable and fruitful suggestions about problems relevant to both linguistics and logic. Several ideas...