In 1797, in what is now the Czech Republic, Pin as Hurwitz published one of the best-selling Hebrew books of the modern era. Nominally an extended commentary on a sixteenth-century kabbalist text, The Book of the Covenant was in fact a compendium of scientific knowledge and a manual of moral behavior. Its popularity stemmed from its ability to present the scientific advances and moral cosmopolitanism of its day in the context of Jewish legal and mystical tradition. Describing the latest...