In its paper shroud, the article is invisible; it is not enticing; it does not inform the passer-by of its nature and qualities.
There is one resource left which would leave the bird uncovered: simply to case the head in a paper cap.

The head being the part most menaced, because of the mucous membrane of the throat and eyes, it would be enough, as a rule, to protect the head, in order to keep off the Flies and thwart their attempts.
Let us continue to study the Bluebottle, while varying our means of information.

A tin, about four inches deep, contains a piece of butcher's meat.

The lid is not put in quite straight and leaves a narrow slit at one point of its circumference, allowing, at most, of the passage of a fine needle.

When the bait begins to give off a gamy scent, the mothers come, singly or in numbers.