"You will greatly assist us in obtaining good results if you will kindly use a little discretion in the matter of your food, especially on the day of the meeting, when fish, vegetables, fruit (especially bananas), and light food of that description are most helpful, but meat, wine, beer, or spirits (wine and spirits especially) should be carefully avoided; and we find that it is better to make a good meal in the middle of the day, a substantial tea at 5.30, and supper after the meeting, as by following this plan the members of the circle are able to give off more of the spiritual _aura_ which is used by the controls in building up the forms which appear to us, each member of the circle contributing his or her share unconsciously. "The use of non-actinic light, such as that obtained from a small dark lantern, is defended on the grounds that the actinic rays coming from the violet end of the spectrum are so rapid in their movements that they immediately break up any combination of matter produced under such circumstances. Any form of light, except the red, or perhaps the yellow, rays would have this effect. That is one reason why the cabinet is employed, because that would shut off any form of light from the medium whilst the forms are building up; although on several occasions, from time to time, when the form has thus been built up fully, we have been able to use a red light strong enough to illuminate the whole of the room." So long as spiritualists, as I have before remarked, maintain this attitude, so long must they meet with incredulity on the part of official science. In nearly all these private circles the precautions taken against trickery are absurdly lacking, and, as we have just seen, frequently purposely omitted. Thus we have to fall back in considering the genuine character of the phenomena on the good faith of the medium. When the medium is known to be a man of blameless life, and has long been before the public undetected in any deception, the presumption would certainly appear to be in favour of his bona-fides. But of what value is this presumption should the medium not be conscious of his actions when his impersonation of this or that character is wholly undertaken by his secondary or subliminal self? Here we begin to have glimmerings of the great truth which may conceivably underlie the parable of Dr Jekyll and Mr Hyde, and investigations into the marvels of multiple personalities lead us further towards the light. * * * * * On the whole, the conclusion I have arrived at is that, where the element of fraud is eliminated, we might rationally seek for an explanation in hallucination. Take the famous case of Archdeacon Colley and Mr Monck. The Archdeacon actually declared that he saw the psychic or spirit form grow out of his left side: