The scheme that I had devised may possibly have been put into use by
others. But of this I know not. I thought it a good scheme and
determined to experiment with it, and, if possible, to make a trap which
should catch a burglar. I would reveal this plan to no one but my friend
the physician and my wife. Secrecy would be an important element in its
success.

Our library was a large and pleasant room on the ground floor of the
house, and here I set my trap. It was my habit to remain in this room an
hour or so after the rest of the family had gone to bed, and, as I was
an early riser, I was always in it again before it was necessary for a
servant to enter it in the morning.

Before leaving the library for the night I placed in a conspicuous
position in the room a small table, on which was a tray holding two
decanters partially filled with wine, in the one red and in the other
white. There was also upon the tray an open box of biscuit and three
wine-glasses, two of them with a little wine at the bottom. I took pains
to make it appear that these refreshments had been recently partaken of.
There were biscuit crumbs upon the tray, and a drop or two of wine was
freshly spilled upon it every time the trap was set. The table, thus
arranged, was left in the room during the night, and early in the
morning I put the tray and its contents into a closet and locked it up.

A portion of my narcotic preparation was thoroughly mixed with the
contents of each of the decanters in such proportions that a glass of
the wine would be sufficient to produce the desired effect.

It was my opinion that there were few men who, after a night walk and