In practice however I restrict the term to those objects which can in some sense or other be said to have a situation in an event; namely, in the phrase 'There it is again' I restrict the 'there' to be the indication of a special event which is the situation of the object.

Even so, there are different types of objects, and statements which are true of objects of one type are not in general true of objects of other types.

The objects with which we are here concerned in the formulation of physical laws are material objects, such as bits of matter, molecules and electrons.

An object of one of these types has relations to events other than those belonging to the stream of its situations.

The fact of its situations within this stream has impressed on all other events certain modifications of their characters.