The sensory acts are accordingly distinguished by their objects.

The thing of which the act of perception is the perception is experienced as something not mental.

But unfortunately Locke treated ideas of reflection as if they were another class of objects of contemplation beside ideas of sensation.

Such being the nature of mental life, the business of psychology is primarily to describe in detail the various forms which attention or conation assumes upon the different levels of that life.

Mental life is indeed practical through and through. It begins in practice and it ends in practice.

When we come to images or memories or thoughts, speculation, while always closely related to practice, is more explicit, and it is in fact not immediately obvious that such processes can be described in any sense as practical.

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