IV. _Subconscious intelligence underlying dreams._ As is well known, Freud advanced the theory, now well fortified by numerous observations of others, that underlying a dream is a subconscious process which fabricates the conscious dream. According to Freud and his followers this subconscious process is always an antecedent wish and the dream is an imaginary fulfillment of that wish. This part of the theory (as well as the universality of an underlying process) is decidedly questionable. My own observations lead me to believe that a dream may be also the expression of antecedent doubts, scruples, anxieties, etc., or may be an answer to an unsolved problem. We need not concern ourselves with this particular question here. I refer to it simply to point out that its correct solution depends upon the correct determination of the true causal factor which is necessarily antecedently unknown and must be inferred. It is inferred or selected from the associated memories evoked by the so-called method of analysis. Hence it must be always an element open to greater or less doubt. _Dreams are a type of hallucinatory phenomena_ and therefore we should expect that their mechanism would correspond more or less closely with that of other hallucinatory phenomena. With the object in view of determining whether a dream could be produced _experimentally_ and brought within the category of phenomena where the causal factor was antecedently known, and thus determine the actuality of a subconscious process as a necessary intervening link between the two, I made the following experiment. It should be noted that a wish _fulfilment_ necessarily means a dream content so far different in form from the content of the _wish itself_ that the postulation of a connecting link, conscious or subconscious, is required. I also sought, if a subconscious process could be postulated, to discover how elaborate and what sort of a work of constructive imagination a subconscious wish could evolve. To a suitable subject while in a deep hypnotic trance state I gave a suggestion in the form of a wish to be worked out to fulfilment in a dream. It so happened that this subject was going through a period of stress and strain for which she sought relief. I also knew that she had a very strong desire to do a good piece of original psychological work and had advised her to take up the work as a solution of her difficulties. So, taking advantage of this desire, I impressed upon her, for the purpose of emphasizing the impulsive force of the desire, that she now had the longed-for opportunity as the culmination of her previous years of training to do the work. I then gave her the following suggestion: “You want to do a good piece of original work and your dream to-night will be the fulfillment of the wish.” No hint as to what form the dream fulfilment should take was given, nor had she any knowledge before being put into the trance state that I intended to make an experiment.