Desc: Les gaz mortels: Directed by Abel Gance. With Léon Mathot, Émile Keppens, Doriani, Henri Maillard. Dr. Hobson is a humanist scientist who studies snakes. He saves Maud, a young American girl, who is abused by Ted, a violent snake hunter. But when the First World War begins, Hobson is summoned by the French army to invent deadly gases.