For the most part Laurie had kept his eyes upon the medium in the cabinet.  There the man had leaned back, plainly visible for the most part, with even the paleness of his face and the dark blot of his beard clearly discernible in the twilight.  Now and then the boy’s eyes had wandered to the other faces, to the young clergyman’s opposite downcast and motionless, with a sort of apprehensive look and a determination not to give way—­to the three-quarter profiles of the two women, and the gleam of the pince-nez below Lady Laura’s frizzed hair.

So he had sat, the thoughts at first racing through his brain, then, as time went on, moving more and more slowly, with his own brain becoming ever more passive, until at last he had been compelled to make a little effort against the drowsiness that had begun to envelop him.  He had had to do this altogether three or four times, and had even begun to wonder whether he should be able to resist much longer, when a sudden trembling of the table had awakened him, alert and conscious in a moment, and he had sat with every faculty violently attentive to what should follow.

That trembling was a curious sensation beneath his hands.  At first it was no more than might be caused by the passing of a heavy van in the street; only there was no van.  But it had increased, with spasms and recoils, till it resembled a continuous shudder as of a living rigid body.  It began also to tilt slightly this way and that.

Now all this, Laurie knew well, meant nothing at all—­or rather, it need not.  And when the movement passed again through all the reverse motions, sinking at last into complete stillness, he was conscious of disappointment.  A moment later, however, as he glanced up again at the medium in the cabinet, he drew his breath sharply, and Mr. Jamieson, at the sound, wheeled his head swiftly to look.

There, in the cabinet, somewhere overhead behind the curtain, a faint but perfectly distinct radiance was visible.  It was no more than a diffused glimmer, but it was unmistakable, and it shone out faintly and clearly upon the medium’s face.  By its light Laurie could make out every line and every feature, the drooping clipped moustache, the strong jutting nose, the lines from nostril to mouth, and the closed eyes.  As he watched the light deepened in intensity, seeming to concentrate itself in the hidden corner at the top.  Then, with a smooth, steady motion it emerged into full sight, in appearance like a softly luminous globe of a pale bluish color, undefined at the edges, floating steadily forward with a motion like that of an air balloon, out into the room.  Once outside the cabinet it seemed to hesitate, hanging at about the height of a man’s head—­then, after an instant, it retired once more, re-entered the cabinet, disappeared in the direction from which it had come, and once more died out.

Well, there it had been; there was no doubt about it....  And Laurie was unacquainted with any mechanism that could produce it.