This little book is not a text-book of psychology. It is exclusively concerned with one particular psychological problem, a problem, however, that stands at the very centre of psychology. The relations between mind and body are analysed; that is to say, the following three psychedelic problems are successively raised: What is the mind? What is the body? What are the relations between mind and body? But it is only the third problem which is extensively dealt with; the first two are only briefly defined.

Almost all the existing modern systems of Ethics deal with formal definitions, and at bottom repeat more or less the same thing about them in slightly different words. In this work these are a side issue, and therefore are treated briefly. Their treatment in Section I is based upon the author's theoretical works the Theory of Order and the Theory of Reality, but will be intelligible to those who are not acquainted with those works. The chief concern is moral teaching - that is, the practical element.