The small engine attached to the Neuilly steam-tram whistled as it passed the Porte Maillot to warn all obstacles to get out of its way and puffed like a person out of breath as it sent out its steam, its pistons moving rapidly with a noise as of iron legs running. The train was going along the broad avenue that ends at the Seine. The sultry heat at the close of a July day lay over the whole city, and from the road, although there was not a breath of wind stirring, there arose a white, chalky, suffocating, warm dust, which adhered to the moist skin, filled the eyes and got into the lungs. People stood in the doorways of their houses to try and get a breath of air. The windows of the steam-tram were open and the curtains fluttered in the wind. There were very few passengers inside, because on warm days people preferred the outside or the platforms. They consisted of stout women in peculiar costumes, of those shopkeepers' wives from the suburbs, who made up for the distinguished looks which they did not possess by ill-assumed dignity; of men tired from office-work, with yellow faces, stooped shoulders, and with one shoulder higher than the other, in consequence of, their long hours of writing at a desk. Their uneasy and melancholy faces also spoke of domestic troubles, of constant want of money, disappointed hopes, for they all belonged to the army of poor, threadbare devils who vegetate economically in cheap, plastered houses with a tiny piece of neglected garden on the outskirts of Paris, in the midst of those fields where night soil is deposited. A short, corpulent man, with a puffy face, dressed all in black and wearing a decoration in his buttonhole, was talking to a tall, thin man, dressed in a dirty, white linen suit, the coat all unbuttoned, with a white Panama hat on his head. The former spoke so slowly and hesitatingly that it occasionally almost seemed as if he stammered; he was Monsieur Caravan, chief clerk in the Admiralty. The other, who had formerly been surgeon on board a merchant ship, had set up in practice in Courbevoie, where he applied the vague remnants of medical knowledge which he had retained after an adventurous life, to the wretched population of that district. His name was Chenet, and strange rumors were current as to his morality.