It [the physical world is a thing; not like space, which is a mere negation; nor like time, which is — Heaven knows what!
The Nature of the Physical World, Introduction (p. ix), The Macmillan Company. 1930
It [the physical world is a thing; not like space, which is a mere negation; nor like time, which is — Heaven knows what!
The Nature of the Physical World, Introduction (p. ix), The Macmillan Company. 1930