all, saw the door of the drawing-room open, and
a little girl, related to himself, come out, and run across the hall
into another room. He spoke to her, but she did not answer. He
instantly entered the drawing-room, where the child was sitting in a
white evening-dress. When she ran across the hall, the moment
before, she was dressed in dark blue serge. No explanation of the
puzzle could be discovered, but it is fair to add that no anxiety
was excited.

7. (A) A young lady had a cold, and was wearing a brown shawl.
After lunch she went to her room. A few minutes later, her sister
came out, saw her in the hall, and went upstairs after her, telling
her an anecdote. At the top of the stairs, the brown-shawled sister
vanished. The elder sister was in her room, in a white shawl. She
was visible, when absent on another occasion, to another spectator.

In two other cases (A) ladies, in their usual health, saw their
husbands in their rooms, when, in fact, they were in the drawing-
room or study. Here then are eight cases of non-coincidental
hallucination, some of people awake, some of people probably on the
verge of sleep, which are wholly without 'coincidence,' wholly
unveridical. None of the 'percipients' was addicted to seeing
'visions about.' {199}

On the other side, though the writer knows several people who have
'seen ghosts' in haunted houses, and other odd phenomena, he knows
nobody, at first hand, who has seen a 'veridical hallucination,' or
rather, knows only one, a very young one indeed. Thus, between
these personally collected statistics of spectral 'sells' on one
part, and the world-wide diffusion of belief in 'coincidental'
hallucination on the other, the human mind is left in a balance
which mathematics, and the Calculus of Probabilities (especially if
one does not understand it) fail to affect.

Meanwhile, we still do not know what causes these solitary
hallucinations of the sane. They can hardly come from diseased
organs of sense, for these would not confine themselves to a single
mistaken message of great vivacity. And why should either the
'sensory centre' or the 'central terminus' just once in a lifetime
develop this uncanny activity, and represent to us a person to whom
we may be wholly indifferent? The explanation is less difficult
when the person represented is a husband or child, but even then,
why does the activity occur once, and only once, and _not_ in a
moment of anxiety?

The