The very barber of the Arabian Nights shall be at work before him, shaving heads; he shall see Aladdin playing on the streets; who knows but among those nameless vegetables the fruit of the nose-tree itself may be exposed for sale? And the interest is heightened with a chill of horror. Below, you hear, the cellars are alive with mystery; opium dens, where the smokers lie one above another, shelf above shelf, close-packed and grovelling in deadly stupor; the seats of unknown vices and cruelties, the prisons of unacknowledged slaves and the secret lazarettos of disease.