ABSTRACT
The empirical content of the Special Theory of Relativity as here expounded lies in the fact that we can apply it to physical systems, and find that the time told by our regraduated system is the same as the time told by physical systems. The Lorentz transformations are not only derivable a priori, but applicable to actual physical phenomena. Both empirical and rational elements enter into our understanding of time and space. Both approaches are valuable, neither completely adequate; and it is one of the tasks of philosophy to show how a priori and empirical considerations are intermingled in constituting our concepts, so that time is neither, as empiricists assume, merely what the clocks say, nor, as philosophers are popularly supposed to believe, a matter to which all considerations of time-telling or punctuality are totally irrelevant.
