It is probable that everybody who is at all a constant dreamer has had at least one experience of an event or a sequence of circumstances which have come to his mind in sleep being subsequently realised in the material world. But, in my opinion, so far from this being a strange thing, it would be far odder if this fulfilment did not occasionally happen, since our dreams are, as a rule, concerned with people whom we know and places with which we are familiar, such as might very naturally occur in the awake and day-lit world. True, these dreams are often broken into by some absurd and fantastic incident, which puts them out of court in regard to their subsequent fulfilment, but on the mere calculation of chances, it does not appear in the least unlikely that a dream imagined by anyone who dreams constantly should occasionally come true. Not long ago, for instance, I experienced such a fulfilment of a dream which seems to me in no way remarkable and to have no kind of psychical significance. The manner of it was as follows. A certain friend of mine, living abroad, is amiable enough to write to me about once in a fortnight. Thus, when fourteen days or thereabouts have elapsed since I last heard from him, my mind, probably, either consciously or subconsciously, is expectant of a letter from him. One night last week I dreamed that as I was going upstairs to dress for dinner I heard, as I often heard, the sound of the postman’s knock on my front door, and diverted my direction downstairs instead. There, among other correspondence, was a letter from him. Thereafter the fantastic entered, for on opening it I found inside the ace of diamonds, and scribbled across it in his well-known handwriting, “I am sending you this for safe custody, as you know it is running an unreasonable risk to keep aces in Italy.” The next evening I was just preparing to go upstairs to dress when I heard the postman’s knock, and did precisely as I had done in my dream. There, among other letters, was one from my friend. Only it did not contain the ace of diamonds. Had it done so, I should have attached more weight to the matter, which, as it stands, seems to me a perfectly ordinary coincidence. No doubt I consciously or subconsciously expected a letter from him, and this suggested to me my dream. Similarly, the fact that my friend had not written to me for a fortnight suggested to him that he should do so. But occasionally it is not so easy to find such an explanation, and for the following story I can find no explanation at all. It came out of the dark, and into the dark it has gone again.