We perceive one unit factor in nature; and this factor is that something is going on then--there.

For example, we perceive the going-on of the Great Pyramid in its relations to the goings-on of the surrounding Egyptian events.

We are so trained, both by language and by formal teaching and by the resulting convenience, to express our thoughts in terms of this materialistic analysis that intellectually we tend to ignore the true unity of the factor really exhibited in sense-awareness.

It is this unit factor, retaining in itself the passage of nature, which is the primary concrete element discriminated in nature.

These primary factors are what I mean by events.
Events are the field of a two-termed relation, namely the relation of extension which was considered in the last lecture.