({epsilon}) Its explanations of motion are more fundamental than those expressed in ({delta}); for it explains what is meant by motion itself.

The observed motion of an extended object is the relation of its various situations to the stratification of nature expressed by the time-system fundamental to the observation.

This motion expresses a real relation of the object to the rest of nature.

The quantitative expression of this relation will vary according to the time-system selected for its expression.
This theory accords no peculiar character to light beyond that accorded to other physical phenomena such as sound.

There is no ground for such a differentiation.