The works of the Zürich school referred to contain careful and detailed expositions of individual material. In these materials there are very many typical formations which are unmistakably _analogies_ with _mythological formations_[211]. There arose from the perception of this relationship a new and valuable source for comparative study. The acceptance of the possibility of such a comparison will not be granted immediately, but the question is only whether the materials to be compared really are similar or not. It will also be contended that pathological and mythological formations are not immediately comparable. But this objection must not be raised _a priori_, for only a conscientious comparison can determine whether any true parallelism exists or not. At the present moment all we know is that they are both structures of the imagination which, like all such products, rest essentially upon the activity of the unconscious. Experience must teach us whether such a comparison is valid. The results hitherto obtained are so encouraging that further work along these lines seems to me most hopeful and important. I made practical use of the constructive method in a case which Flournoy published in the _Archives de Psychologie_, although he offered no opinion as to its nature at that time. The case dealt with a rather neurotic young lady who, in Flournoy's publication, described how surprised she was at the connected phantasy-formations which penetrated from the unconscious into the conscious. I subjected these phantasies, which the lady herself reproduced in some detail, to my constructive methods and gave the results of these investigations in my book, "The Psychology of the Unconscious." This book has, I regret to say, met with many perhaps inevitable misunderstandings. But I have had one precious consolation, for my book received the approval of Flournoy himself, who published the original case which he knew personally. It is to be hoped that later works will make the standpoint of the Zürich school intelligible to a wider public. Whoever, by the help of this work, has taken the trouble to grasp the essence of the constructive method, will readily imagine how great are the difficulties of investigation, and how much greater still are the difficulties of objective presentation of such investigations.