PERCEPTIBILITY • DICTIONARY ONE.COM • Definition of Perceptibility

... psychology, the growing importance of embryology among the biological sciences—all this was bound to suggest the idea of a reality which endures inwardly, which is duration itself. So, when a philosopher arose who announced a doctrine of evolution, in which the progress of matter toward perceptibility would be traced together with the advance of the mind toward rationality, in which the complication of correspondences between the external and the internal would be followed step by step, in which change would become the very substance of things—to him all eyes were turned. The ...

— Creative Evolution • Henri Bergson