Torts -- 1957 Tennessee Survey

One who performs an act is ordinarily under a duty to act carefully.When the defendant has acted there is seldom a problem regarding the duty to use care. But when the defendant has failed to act the question of duty raises a substantial problem.' The rule is stated that there is no duty to act, but the exceptions are many. One arises when there is a particular relationship between the parties; another, when the defendant had commenced to act. Both exceptions are involved in Union Carbide & Carbon Corp. v. Stapleton.