WE can imagine a person without any
idea of number; we have even attempted
to picture the gradual acquisition of a sense of
space; but it seems quite impossible to imagine
a conscious being without a sense of time. Pre-
sumably our primary notion of time is due to a
recognition of order or sequence in our own
process of thought, or as Eddington ¹ put it,
"Our minds are immediately aware of a 'flight
of time' without the intervention of external
senses." This primary conception of time as a
sequence of sensations and thoughts has, how-
ever, become highly complex, and in its course
of development many other ideas have become
interwoven with it, for example, the concept of
causality. The scientist's view of time has nu-
merous connotations which are mutually inde-
pendent, and perhaps even contradictory. Dur-
ing the course of these brief chapters I shall be
able to mention only a few of the important
concepts of science, and many of these inade-

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