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.

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

Thus the same object may supply a practical perception to one person and a speculative one to another, or the same person may perceive it partly practically and partly speculatively.

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.

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