The hypothesis of this book is that philosophy's attempt to use metaphysics as a way of securing its primacy among the sciences has resulted instead in its subservience: philosophy, once handmaiden to theology (ancilla theologiae), has now become more or less consciously handmaiden to the sciences (ancilla scientiarum). So it is all the more urgent to explore the nature and limits of this primacy and subservience, as this book does through an archaeological investigation of metaphysics.