awareness of nature. To find evidence of the properties
which are to be found in the manifold of event-particles we must always
recur to the observation of relations between events. Our problem is to
determine those relations between events which issue in the property of
absolute position in a timeless space. This is in fact the problem of
the determination of the very meaning of the timeless spaces of physical
science.

In reviewing the factors of nature as immediately disclosed in
sense-awareness, we should note the fundamental character of the percept
of 'being here.' We discern an event merely as a factor in a determinate
complex in which each factor has its own peculiar share.

There are two factors which are always ingredient in this complex, one
is the duration which is represented in thought by the concept of all
nature that is present now, and the other is the peculiar _locus standi_
for mind involved in the sense-awareness. This _locus standi_ in nature
is what is represented in thought by the concept of 'here,' namely of an
'event here.'

This is the concept of a definite factor in nature. This factor is an
event in nature which is the focus in nature for that act of awareness,
and the other events are perceived as referred to it. This event is part
of the associated duration. I call it the 'percipient event.' This event
is not the mind, that is to say, not the percipient. It is that in
nature from which the mind perceives. The complete foothold of the mind
in nature is represented by the pair of events, namely, the present
duration which marks the 'when' of awareness and the percipient event
which marks the 'where' of awareness and the 'how' of awareness. This
percipient event is roughly speaking the bodily life of the incarnate
mind. But this identification is only a rough one. For the functions of
the body shade off into those of other events in nature; so that for
some purposes the percipient event is to be reckoned as merely part of
the bodily life and for other purposes it may even be reckoned as more
than the bodily life. In many respects the demarcation is purely
arbitrary, depending upon where in a sliding scale you choose to draw
the line.

I have already in my previous lecture on Time discussed the association
of mind with nature. The difficulty of the discussion lies in the
liability of constant factors to be overlooked. We never note them by
contrast with their absences. The purpose of a disc