In the perception of a tree we can distinguish the act of experiencing, or perceiving, from the thing experienced, or perceived.

The mental act of sensation which issues in reflex movement is so simple as to defy analysis.

The sensory acts are accordingly distinguished by their objects.

Psychology is the science of the act of experiencing, and deals with the whole system of such acts as they make up mental life.

Both expectations and memories are more than mere images founded on previous experience.

It may be added, to prevent misunderstanding, that when I speak of contemplated objects in this last phrase as objects of contemplation, the act of contemplation itself is of course an enjoyment.

The perceptive act is a reaction of the mind upon the object of which it is the perception.