Special attention should be paid to ventilation and sanitation. The teacher should put into practical use in the schoolroom the knowledge of the principles of physiology and hygiene. He may thus guard his pupils from many dangers to which they would be exposed through ignorance or neglect of sanitary laws. Many lives have been sacrificed because teachers have not given attention to these things. CT 298.3
Sudden changes of temperature should be avoided. Care should be taken to see that the students do not become chilled by sitting in drafts. It is not safe for the teacher to regulate the heat of the schoolroom by his own feelings. His own good, as well as that of the students, demands that a uniform temperature be maintained. CT 299.1