his figure had been reflected on the surface of the film, which was
highly glazed, but a glance around the room assured me that this
explanation was untenable. Moreover, I found, upon further
investigation, that the film was lying in such a position that it would
be impossible to reflect any person in the room. I then examined the
skylight, only to find that, owing to the sharp inclination of the roof,
it would be an utter impossibility for anyone to reach it from the
outside without the aid of a ladder. I investigated this source further,
thinking to find the reflection on the film to be from some street in
the city below, but on account of the extent of the roof, no street was
visible from the skylight.

Completely baffled, I descended into the room again and turned on the
current. Immediately the shadow appeared on the film, and this time, in
consequence of the room now being quite dark, I noticed that it was
surrounded by a phosphorus-colored glow. The figure was certainly that
of a man, although very faint, and it became evident to me, after
watching it for a while, that he was trying to signal with his arms.

I now noticed that, in addition to the peculiar light on the film, the
entire surface seemed to vibrate with frequent, but scarcely audible,
humming sounds. Upon turning off the current all disappeared, only to
reappear when I switched it on again. It was evident then that the
phenomenon was caused only when the instrument was charged with
electricity, and consequently was no ordinary reflection, as I had at
first supposed.

Everything pointed to its being the manifestation of some outside
agency; possibly electrical waves which my apparatus received and in a
measure responded to, coming through the open skylight from--where? The