which is very nearly one second, as it would rigorously have been in classical science. We see, furthermore, that it is owing to the enormous value of
that the difference between the two sciences is so hard to detect in practice. It is for this reason that the fundamental continuum, though one of space-time, reduces for all practical purposes to the separate space and time of our forefathers, unless very high velocities are considered.
[160] Subject to the limitations mentioned in the previous paragraphs.
[161] See [Appendix I].
[162] We do not know whether Eddington is still prepared to defend these views.
[163] An exceedingly clear presentation of this point has been given by Dr. Silberstein in his remarkable books on the relativity theory.
[164] Although they do not appear to be perpendicular to each other on the diagram, the time and space directions
and