Moreover the proof against her was too overwhelming.

Lechesneau had sent for the under crust of the last loaf of bread she had carried to the cavern, also for the empty bottles and various other articles.

During the senator's long hours of captivity he had formed conjectures in his own mind and had looked for indications which might put him on the track of his enemies.
These he now communicated to the authorities.

Michu's farmhouse, lately built, had, he supposed, a new oven; the tiles or bricks on which the bread was baked would show their jointed lines on the bottom of the loaves, and thus afford a proof that the bread supplied to him was baked on that particular oven.

So with the wine brought in bottles sealed with green wax, which would probably be found identical with other bottles in Michu's cellar.