An excerpt from McGraw-Hill’s Teacher Education Series: Maintaining Classroom Discipline (1947):

Classroom control and learning efficiency are products of good teaching. Learning must be made meaningful. Interest in work for which learners see a purpose provides its own discipline. But in spite of interest and meaning, it must be remembered that some incidents will occur. Skill in handling such occurrences prevents their growth into problems. A friendly attitude with a sprinkling of humor goes a long way toward winning the regard and cooperation of the class, for respect is a more desirable molder of behavior than fear. The development of mutual understanding between teacher and pupils will help eliminate disciplinary problems.