1: Elementary Operations: Time and Motion; One: The Sequence of Events; Two: Duration; II: Physical Time; Three: The Succession of Perceptible Events 1; Four: Simultaneity 1; Five: The Equalization of Synchronous Durations and the Transitivity of Equal Time Relations; Six: The Colligation of Durations and the Transitivity of Unequal Time Relations 1; Seven: The Additive and Associative Composition of Durations; Eight: The Measurement of Time and the Isochronism of Successive Durations 1; III: Age and Inner Time; Nine: The Concept of Age 1; Ten: Actions and Inner Duration 1; 11: Conclusions