Sentence:  I have met with <WSD>nightmen</WSD> who have told me that there was “nothing particular” in the smell of the cesspools they were emptying; they “hardly perceived it.” One man said, “Why, it's like the sort of stuff I've smelt in them ladies' smelling-bottles.” 
Meaning of the word marked with <WSD> tags:  A person whose job is cleaning cesspools or sewers, or emptying privies by night.