Take a tumbler, and half-fill it with strong soap suds. Cut a circle
of stiff paper which will exactly fit into the top of the glass.
In the centre of the paper cut a hole half an inch in diameter,
or, better still, a slice of bread may be placed on the glass.
Smear one side of the disc with molasses, and insert it in the
tumbler with this side downward. Swarms of flies soon surround
it, and one by one find their way downward through the hole. Once
below the paper, and their doom is sealed. For a short time the
molasses absorbs their attention, and they, in turn, absorb the
In their efforts to escape, they one by one precipitate themselves
in the soap suds below, where they speedily perish. The tumbler
is soon half-filled with the dead insects, and where a number of
the traps are set in a single room, the apartment is soon ridden
of the pests.