=Instincts Differ in Value.=--The fact that man's instinctive tendencies thus come within the range of experience, not only renders them amenable to reason, but also leaves the question of their ultimate outcome extremely indefinite. For this reason many instincts may appear in man in forms that seem undesirable. The instinct to seek food is a natural one, yet will be condemned when it causes the child to take fruit from the neighbour's garden. In like manner, the instinct to know his surroundings is natural to man, but will be condemned when it causes him to place his ear to the keyhole. The tendency to imitate is not in itself evil, yet the child must learn to weigh the value of what he imitates. One important reason, therefore, why the teacher should understand the native tendencies of the child is that he may direct their development into moral habits and suppress any tendencies which are socially undesirable. =Education of Instincts.=--In dealing with the moral aspects of the child's instinctive tendencies, the educator must bear in mind that one tendency may come in conflict with another. The individualistic instinct of feeding or ownership may conflict with the social instinct of companionship; the instinct of egoism, with that of imitation; and the instinct of fear, with that of curiosity. To establish satisfactory moral habits on the basis of instinct, therefore, it is often possible to proceed by a method of substitution. The child who shows a tendency to destroy school furniture can best be cured by having constructive exercises. The boy who shows a natural tendency to destroy animal life may have the same arrested by being given the care of animals and thus having his sympathy developed. In other cases, the removal of stimuli, or conditions, for awaking the instinctive tendency will be found effective in checking the development of an undesirable instinct into a habit. The boy who shows a spirit of combativeness may be cured by having a generous and congenial boy as his chum. The pupil whose social tendencies are so strong that he cannot refrain from talking may be cured by isolation.