In the preceding chapter reference was made to jealousy as a cause of sulkiness in children. Jealousy is itself a woeful handicap of childhood, and may be followed by disastrous consequences of many kinds. It has even been known to prompt children to acts as tragic as any committed by jealousy-driven adults. To cite a single instance: In a small country town there lived a family of three persons--father, mother, and young son. Comfortably circumstanced, the parents testified their affection for their only child by loving care and gifts innumerable. Their great aim in life seemed to be to bring joy and pleasure into his life. The boy, for his part, reciprocated their love, and, though of a somewhat nervous temperament, was bright, vivacious, and amiable. There was nothing to mar the happiness of the family circle, which, to the delight of both parents, was one day enlarged by the addition of a little daughter. They had taken it for granted that the coming of this baby sister would be equally pleasing to their boy, then nearly twelve years old. But his attitude towards her was indifferent, even cold; and, as time passed, he showed a dislike for the child as inexplicable as it was disappointing to his father and mother. Also, his disposition gradually changed. He was no longer high-spirited, but became moody and depressed. He would sit by himself for hours, lost in mournful reverie. His parents, rightly suspecting that something was preying on his mind, tried to get his confidence. He put them off with evasive answers, or brusquely asserted that he was "all right." The true explanation came to them in startling and gruesome fashion. Late one afternoon, his father being absent from the house and his mother occupied downstairs, the boy made his way to the room, where his tiny sister was peacefully asleep in her crib. Only a short time passed before his mother's return upstairs, but in the interval the little one had been smothered to death by her jealous brother. Such an instance of juvenile crime incited by the demon of jealousy is fortunately rare. But it by no means stands alone, and while the hand of reason usually restrains even jealous children, in no individual case is it possible to say with assurance that tragedy will not result if jealousy gets firm lodgment in the child's mind. If for this reason only, parents should regard with concern any repeated manifestations of jealousy, in no matter how mild and seemingly harmless a form. As a matter of fact, however, many parents are not in the least disturbed when their children give evidence of being jealous. Some parents seem to be positively pleased at signs of jealousy in their children, interpreting them as proofs of the ardour of the children's love. One thoughtless mother put it thus: