was sufficient space for the ape to get from one room to the other.

This ape, some four feet in height, was exceedingly powerful and more
than usually imitative, but was not naturally vicious. Any action done in
its presence the animal would be certain to repeat at the first
opportunity; but having done so, it did not repeat it again unless the
action was performed again. The action of strangling a man in his sleep
by means of a cord was performed before the ape, and afterwards the
animal was allowed to steal through the hole in the chimney. The result
was that Greaves was found dead.

It was intended that Quarles should die in a like manner, and special
pains were taken with the ape to insure success. The action was performed
before the animal in every detail more than once, and it was kept in
strict confinement until the right moment came.

The ape was out of my sight, but I chanced to see the imitation in
progress on the Thursday night through the glass, which had unaccountably
been left open for some minutes after it had been tried to see that it
was in working order. I saw only dimly because the imitation was being
done by the light of a single candle, and that shaded as much as
possible, to suggest to the ape the gloomy conditions of the room in
which it was to repeat its lesson. Let into the wall of the room in the
boarding-house there was a glass backing on to the one in the haunted
room. A small handle swung aside the back, which was common to both, and
the looking-glass became a window from one room to the other.

When he fired Quarles evidently hit the ape. Mad with pain, the animal
dashed back through the hole in the chimney and attacked the doctor, who
was probably taken entirely unawares, as he was looking through the glass