3. Mr. Bush, in his recent pamphlet, “Spirit Photography Exposed,” describes a piece of apparatus made out of an empty blacking-tin containing a small electric bulb, one side of the tin being replaced by a positive transparency of the desired extra. This, he alleges, is used by Hope, the Crewe spirit photographer, the transparency being pressed against the plate and the light switched on for a second. If carefully faced with black velvet round the transparency, this device should be quite useful; but it must be remembered that an escaping ray of white light would at once catch the eye in the dark-room. Skilful palming and manipulation should make it quite possible for an extra to be printed on the plate in this way, if the medium can cover it with his hand for a moment or two. All Hope’s results are certainly not produced in this way, however, as is implied by Mr. Bush. 4. The medium may palm a positive transparency; if he is allowed to handle the plate he will hold it close to the red lamp with the transparency between; if the lamp is rather bright, or is not a very deep red, an impression is soon made on the plate. 5. With a pinhole in the dark-room lamp, and a transparency inside--a perfectly practicable arrangement with some of the more complicated dark-room “safe-lights,”--a pinhole projector can be formed, which will throw an image on a suitably-placed plate. Any leakage of white light into the dark-room, either from the lamp or from outside, can be used to produce blotches and streaks on the plate. A very little mechanical ingenuity will enable a medium who takes a pride in his work to rig up an arrangement of this kind which can be switched off and on at will and which will project an image on a predetermined spot on the bench. By the simple expedient of having the bench so cluttered up with bottles and miscellaneous rubbish that this spot is the only unencumbered one, the unsuspecting sitter may be forced to lay a plate on this spot while, for example, he is marking another. The medium may ostentatiously stand at the other end of the room and “switch on” for a moment while the sitter’s attention is engaged with his marking. 6. Photographic plates are sensitive to rays invisible to the eye, as has been pointed out in considering the effect of fluorescent substances. X-rays and ultra-violet rays, for instance, both invisible yet strongly actinic, might be used in the most baffling manner in the production of spirit extras. The expense and technical difficulties would be considerable, but were any medium to take the method up, he might safely defy the most critical investigation and would soon recoup himself for the few pounds initial outlay.