Morton answered quickly. "It was enough, if properly conditioned. The theory is--I've been reading up on it--that these spook brethren of ours attack their doubters in different ways. Knowing you to be a man of materialistic and rather methodical habit of mind, the powers essayed a material test. Perhaps it was a mouse?" "Or the cat?" suggested Kate. "They must have been musical and of exceptional intelligence, then," put in Britt, "for they played up and down on the key-board at my request, and kept time to 'Yankee Doodle.'" Kate exulted. "What do you think of that, Morton? If one is true, then all may be true." Britt went on. "No. Whatever the power was, it was controlled by human intelligence. It answered to my will." "You were convinced of that." Morton's glance was keen, keener than he knew. "If you admit that one of these manifestations is true you open the door for the witches." Britt was a little nettled. "All this took place precisely as I relate it, in the dark, of course. But one sense, that of touch, controlled the situation--hearing took the rest." "It all shows the inadequacy of human evidence. You must not expect any one to believe that such a manifestation took place. It is like the stories we hear of haunted houses. A friend of mine the other day was telling me of a ghost that frequented an Australian bungalow where he was visiting last year. Said he: 'I saw vases thrown from the mantel-piece in broad daylight. I've heard invisible feet tramping all about my chair in a vividly lighted room.' I didn't believe him, of course. The fact is, we don't know our own capacity for being deceived. We are each a microcosm--a summing-up of all our forebears, and in the obscure places of our brains are the cells of cavemen, nooks troubled by shadows and inhabited by strange noises. If you come at me in the right way you can raise a terrifying echo deep in some knot of my brain-cells; but it is only the echo of a far-away cry--it is not even the cry." Britt poised himself. "Let me tell you this. I have started in to understand this thing. It isn't a haphazard series of deceits, of that I am at this moment convinced. The most amazing consideration to my mind is this: there is _system_ in their fool-tricks. I don't mean Miss Lambert alone, I mean in all the best-authenticated manifestations. As you say, they know how to attack the public; the ones who don't are exposed and drop out; but, generally speaking, they go on smoothly because they know just what can be safely attempted and what can't. Now in Miss Lambert's case the same system appears. Her alleged phenomena fit into the scheme, her development is according to the spiritualistic Hoyle. No originality is permitted, hence no failure of effect." "And yet my brother tells me she is quite young and engaging." "Altogether charming in body, and in every other thought most ingenuous."