Bedbugs

Bedbugs are a recurring nuisance in the poor and crowded interiors of the novel, making the conditions of ordinary life physically palpable. They first appear as one of the parasites Ferdinand brings home from his patients; later, in Toulouse, they keep Robinson and Grandma Henrouille’s household awake and become the targets of a homemade corrosive treatment that Ferdinand tests with Grandma Henrouille’s help.

From Patients to Home

When Ferdinand visits Professor Baryton, the physician complains that his rooms are full of drafts and fleas. Ferdinand confirms that he has fleas at home, explaining that he brings them back from his patients. The exchange places infestation within the everyday traffic between sick bodies, medical work, and domestic space: disease and discomfort do not remain neatly contained in the clinic or the patient’s room.

A Household Kept Awake

In Toulouse, bedbugs afflict the house where Robinson and Grandma Henrouille are living. During a visit, Madelon reports that they keep everyone awake, especially on stormy nights, and that the household burns sulfur to combat them. The detail sits alongside the family’s other precarious circumstances: Robinson is recovering from his injuries and may soon be able to go out alone, while Grandma Henrouille is doing well in the crypt business and saving money. The infestation is a persistent condition of their home, not an isolated inconvenience.

Improvised Eradication

After dinner, when the house sinks into age and dilapidation, the bedbugs emerge. Ferdinand uses the infestation to test a corrosive formula that he hopes to sell to a pharmacist for a modest profit. Grandma Henrouille joins the work, carrying a candle while the two move from nest to nest and crack to cranny, spraying the swarms with vitriol. The insects scatter and disappear in the candlelight, but the scene offers no lasting cure; it shows instead a practical, improvised response conducted inside the very conditions that sustain the nuisance.

Narrative Significance

Bedbugs connect poverty to the intimate material environment: they disturb sleep, inhabit cracks in a decaying house, and demand labor from people who have little comfort to spare. Their recurrence also gives Ferdinand’s medical and commercial instincts a small domestic stage. He turns an infestation into an experiment and possible source of income, while Grandma Henrouille’s candle makes her an active partner in the task. The episode’s dark humor comes from the scale of the ambition—a little profit from a corrosive remedy—set against the stubborn abundance of pests and the household’s broader hardship.