Jack London's John Barleycorn (1913) is a searching autobiographical memoir and social diagnosis of alcohol's place in modern life. Named for the folk personification of liquor, the book traces London's encounters with drink from boyhood hardship through maritime adventure, literary fame, and domestic disillusion. Its style combines confessional candor, naturalist observation, and polemical argument, placing private experience within the broader contexts of working-class sociability, masculine ritual, and Progressive Era debates over temperance. London was unusually equipped to write such a work. Born into poverty in 1876, he labored as a cannery worker, sailor, oyster pirate, and gold-seeker before becoming one of America's most celebrated authors. His fiction often examined survival, appetite, social force, and the fragile veneer of civilization; John Barleycorn turns those concerns inward. London's own drinking, his socialist sympathies, and his acute awareness of bodily and psychological struggle all inform the book's urgency. Readers interested in autobiography, addiction studies, American naturalism, or early twentieth-century reform culture will find John Barleycorn indispensable. It is neither simple confession nor moral tract, but a disturbing, intelligent meditation on freedom, compulsion, and the social habits that shape desire.