This document discusses the law of torts and the defense of contributory negligence. It defines negligence as a failure to take reasonable care and explains that contributory negligence occurs when the plaintiff's own lack of care contributes to the harm caused by the defendant's negligence. The landmark 1809 case Butterfield v. Forrester established that a plaintiff who fails to exercise reasonable caution and contributes to their own injury cannot recover damages. The defense of contributory negligence means any claim for damages is precluded if the plaintiff is also found negligent, no matter how minor their role in the accident.