These tests probably exclude few applicants who should be admitted. Experience proves that they include many who, for their own sake and for children's sake, should be rejected. The moral character, physical fitness, quality of voice, personal bearing, self-command, executive ability, capacity for supervision, are qualities that are modified by conditions. The voice that is satisfactory in conference with an examiner may be strident and irritating when the teacher is impatient or is trying to overcome street noises. On parade applicants are equally cleanly; this cannot be said of teachers in the service, coming from different home environments. Self-command is much easier in one school than in another. Physical fitness in a girl of twenty may, during one short year of teaching, give way to physical unfitness. Therefore the need for _periodic tests_ by principal, superintendent, and school board, _to determine the continuing fitness_ of a teacher to do the special task assigned to her, based upon physical evidence of her own vitality and of her favorable influence upon her pupils' health and enjoyment of school life. Shattered nerves due to overwork may explain a teacher's shouting: "You are a dirty boy. Your mother is a dirty woman and keeps a dirty store where no decent people will go to buy." A physical examination of that unfortunate teacher would probably show that she ought to be on leave of absence, rather than, by her overwork and loss of control, to cause the boys of her class to feel what one of them expressed: "Grandmother, if she spoke so of my mother I would strike her."