No preface to this little book is really needed. I have written it in order to say some things which I wished to say. The opinions I hold I have stated as clearly as I could, and I have endeavoured to support them with fairness. I recognise that they are only opinions. But I venture to think that, even if they are not fully accepted, they may still be regarded as worthy of consideration, because of their having, if only in part correct, a possibly useful outcome in the general study of mental disorders.

A. M.

34 Drummond Place, Edinburgh. Jany. 1905.