The book satirically catalogs a social type of ostentatious would-be gentlemen, treating them as if subjects of natural history. Through humorous chapters and a mock‑scientific preface, it details their affected speech, fashionable but mismatched dress, cigar and cane habits, public behaviors on omnibuses, in theatres, and on riverboats, and their intrusive courtship and pretensions to style. Short sketches and anecdotes expose the gap between assumed status and actual vulgarity, arguing that imitation of gentility invites ridicule and social disapproval.