Thomas Day, an 18th-century British writer and radical, knew exactly the sort of woman he wanted to marry. Pure and virginal like an English country maid yet tough and hardy like a Spartan heroine, she would live with him in an isolated cottage, completely subservient to his whims. But after being rejected by a number of spirited young women, Day concluded that the perfect partner he envisioned simply did not exist in frivolous, fashion-obsessed Georgian society. Rather than conceding defeat and...