Vetter, Barbara (2015). Potentiality From Dispositions to Modality. Oxford: Oxford University Press 1. ModalityThe two familiar modalities: necessity (□) and possibility (◇)Modal phenomena: (1) laws of nature, (2) essences, (3) the counterfactual conditional, (4) causation, and (5) dispositions 2. Reductive vs. Non-reductive approaches ① A reductive approach: describe all of these phenomena in a..