How do the psychic images get on to the plate? Far too much time, in the past, has been lost in attempting to convince those who do not believe (and those who do not _want_ to believe), of the genuine nature of psychic photography, and our ignorance of this phenomenon is appalling. The difficulties attending scientific research in this domain are considerable. So far, we can only definitely say that in many instances the psychic figures on the plate are not objective in the same sense as the sitters. The supernormal images have every appearance of having been projected on to the sensitive plate, independently of the lens and camera. In employing several cameras simultaneously, together with a stereo camera, I have only succeeded so far in securing a psychic image on one of the plates exposed. There are indications that in some cases the psychic effects are printed on to the plate through a psychic equivalent to our normal transparency—in fact, it has come to be known as a psychic transparency. Identical transparency markings are to be found on the plates of photographic sensitives from all parts of the world. These particular markings can clearly be seen over the negative obtained by Mr. Harry Price in his experiment with Mr. Hope. I am convinced that the effect obtained on this occasion was a genuine psychic result. The possibility of this is freely admitted by Mr. Price. The fact that in nine cases out of ten the psychic images are the same way up as the sitter suggests that the “something” that occurs actually takes place after the plate has been inserted in the dark slide. Such small points as these may eventually play an important part in the final solution of the _modus operandi_. Now let us return to the object of this book—the question of evidence. Sir Arthur Conan Doyle has dealt so thoroughly, earlier in these pages, with the recent attacks by the S.P.R. and the Magic Circle that I do not propose to refer to them again here at length. As illustrating the impartial attitude of the Society of which I have the honour to be Secretary, however, I would like to say that almost immediately on the publication of these critical reports the matter was discussed by the members of this Society, and it was arranged to subject the whole of the evidence to a thorough investigation. In this connection the S.S.S.P., in conjunction with the B.C.P.S., sought the co-operation of the Society for Psychical Research and the Occult Committee of the Magic Circle.