The Concept of Time deals with tense and tenselessness; periods and instants; the measurement of time; time, change and causation. The author attempts to show how considerations in the philosophy of logic and language are needed to settle many of the issues here. For example, the debate about tenselessness turns out to hinge largely on whether a genuinely tense-free language is conceivable; and the possibility of time without change is grounded in what makes duration-statements have the sense they do.