ABSTRACT
The four words of the title of this chapter are in common usage and good standing. Their popular usage is very vague and uncertain; but in literature, which consists so largely of psychological description and analysis, they are used with more consistency. It must be confessed that psychology, so far from clarifying the topics implied by these words, has reduced them to one vast confusion and has made the words themselves wellnigh useless. I renew here, in concise form, my earlier efforts to introduce a little system and order into this obscure field. 1
