If we are to distinguish mere non-being from that which is not, yet may be, from that which was not, yet could have been, or from that which will not be, yet could become, we are committed in some way to grant being to possibilities. The possible is not actual; yet it is not nothing. What then could it be? What ontological status could it possess? In Contingency, Time, and Possibility: An Essay on Aristotle and Duns Scotus, Pascal Massie opens these questions by combining two approaches: First, an original inquiry that analyses the notions of chance, fate, event, contradiction, and so forth,...