Morton Prince 
Unconscious the Fundamentals of Human, Personality Normal and Abnormal [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. In a recently published article M. Bergson con cludes with the following prophesy: To explore the most sacred depths of the unconscious, to labor in what I have just called the subsoil of conscious ness, that will be the principal task of psychology in the century which is opening. I do not doubt that wonderful discoveries await it there, as important perhaps as have been in the preceding centuries the discoveries of the physical and natural sciences. That at least is the promise which I make for it, that is the wish that in closing I have for it.