This work does not call for lengthy comment here, since (to quote the author's own words) it 'is not a book about what is called "psycho-analysis"'. But it is interesting enough in its own way. It contains the account of certain observations which tend to show that our experience at a given moment can to some extent be influenced by our own future experience. The author's attention was first directed to the matter by certain striking dreams, some elements of which presented a startling resemblance to waking experiences that followed shortly afterwards. He then proceeded to a more systematic investigation of dreams and found his impressions corroborated, both as regards his own dreams and those