This engrossing study investigates the infancy of American Sign Language (ASL). Authors Ted Supalla and Patricia Clark highlight the major events in ASL history, revealing much of what has not been clearly understood until now. According to tradition, ASL evolved from French Sign Language. The authors analyze the metalinguistic assumptions of these early accounts and also examine in depth a key set of films made by the National Association of the Deaf (NAD) between 1910 and 1920.