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Cast

Happy O'Brien, called "The Microbe," or "Mike" for short, a female street urchin who sells newspapers dressed as a boy to avoid harassment, is saved from arrest for fighting other newsboys in Chinatown by wealthy author DeWitt Spense. DeWitt, there to purchase drugs, is so moved by Mike's pugnacity, that he takes her to his mansion for literary inspiration. When DeWitt learns that Mike is a girl, he resolves to educate her. As Mike blossoms, DeWitt's attentions turn to love, to the dismay of Judith Winthrope, who wants to marry him, and his friend Robert Breton, who, with Judith, convinces Mike that DeWitt's writing is suffering because of her.

Showman Jerry Travers is working for producer Horace Hardwick in London. Jerry demonstrates his new dance steps late one night in Horace's hotel room, much to the annoyance of sleeping Dale Tremont below. She goes upstairs to complain and the two are immediately attracted to each other. Complications arise when Dale mistakes Jerry for Horace.

Yvonne, daughter of Philibert, a Paris cafe owner, is in love with dreamy, blundering Albert, a waiter, though he pays little attention to her. Philibert plans to marry his daughter to a wealthy Parisian, but upon learning that Albert is to come into a large inheritance, he conspires to place him under a longterm contract, confident that he willingly will pay a forfeit to break it.

William Lowry rescues Claudia Royce from a burning building, and upon hearing that her parents are trying to force her to accept millionaire Leland, whom she does not love, he proposes a marriage of convenience to himself. She accepts, and Bill arranges a fake ceremony; but when she falls in love with Davidge, Bill refuses her a "divorce." Later, Bill gets rich in the manufacture of a patented fireman's pole, and when he buys a house for Claudia she realizes her love for him and they are legally married.

Anita, a free Emilian girl falls in love with Salvatore, a Neapolitan bersagliere. The two would like to get married, but he drowns while bathing in the river. From that moment the woman is unable to love anyone else because, at the most beautiful, the ghost of her fiancé appears to her who, in the end, will be able to be followed in the other world.

An all-knowing interlocutor guides us through a series of affairs in Vienna, 1900. A soldier meets an eager young lady of the evening. Later he has an affair with a young lady, who becomes a maid and does similarly with the young man of the house. The young man seduces a married woman. On and on, spinning on the gay carousel of life.