We must look for a simpler explanation. Now, when we examine Sir A. C. Doyle's spirit photograph, we find at once that the candour of that earnest and conscientious Spiritualist gives us a clue. He tells us how he bought the plate, examined the camera, and exposed and developed the plate with his own hands. "No hands but mine ever touched the plate," he says impressively. We shall see presently that that need not impress us in the least. What is important is that Sir Arthur adds: "On examining with a powerful lens the face of the 'extra' I have found such a marking as is produced in newspaper process work." Very few of the general public would understand the significance of this, but I advise the reader to take an illustrated book or journal and examine a photograph in it with a lens (which need not be powerful). He will see at once that the figure consists of a multitude of dots, and wherever you find an illustration showing these dots it has been at some time printed in a book or paper. During a lantern lecture, for instance, you can tell, by the presence or absence of these dots, whether a slide has been reproduced from an illustration or made direct from the photographic negative. Sir A. C. Doyle is candid, but his Spiritualist zeal outruns his reason. He goes on to say:-- It is _very possible_ that the picture ... was conveyed on to the plate from some existing picture. However that may be, it was most certainly supernormal, and not due to any manipulation or fraud. This is an amazing conclusion. It is not merely "possible," but certain, that the photo, which he says resembles his son, had been _printed_ somewhere before it got on to his plate. The marks are infallible. It is further practically certain that, when the son of so distinguished a novelist died on active service, his photograph would appear in the Press. It is equally certain that mediums, knowing well that Sir Arthur and Lady Doyle would presently seek to get into touch with their dead son, would treasure that photograph. When I add that, as I will explain presently, there is no need at all for the spirit photographer to touch the plate, the reader may judge for himself how much "supernormal" there is about the matter.