Examining the most rebellious American colony, Massachusetts Bay, Professor Reid finds that law was locally controlled while imperial law was almost nonexistent as an influence on the daily lives of individuals. In Ireland the same English common law, because of imperial control of legal machinery, produced an opposite result. The Irish were forced to resort to secret, underground violence. The author examines various Massachusetts Bay institutions to show the consequences of whig party control, in contrast to the situation in 18th-century Ireland. A general conclusion is that law, the conditions of positive law, and the matter of who controls the law may have more significant effects on the course of events than is generally assumed.