Classifications of children's faults--Peculiar children--Real faults as distinguished from interference with the teacher's ease--Truancy, its nature and effects--The genesis of crime--The lie, its classes and relations to imagination--Predatory activities--Gangs--Causes of crime--The effects of stories of crime--Temibility--Juvenile crime and its treatment. Siegert[1] groups children of problematical nature into the following sixteen classes: the sad, the extremely good or bad, star-gazers, scatter-brains, apathetic, misanthropic, doubters and investigators, reverent, critical, executive, stupid and clownish, naive, funny, anamnesic, disposed to learn, and _blasé_; patience, foresight, and self-control, he thinks, are chiefly needed. A unique and interesting study was undertaken by Közle[2] by collecting and studying thirty German writers on pedagogical subjects since Pestalozzi, and cataloguing all the words they use describing the faults of children. In all, this gave 914 faults, far more in number than their virtues. These were classified as native and of external origin, acute and chronic, egoistic and altruistic, greed, perverted honor, self-will, falsity, laziness, frivolity, distraction, precocity, timidity, envy and malevolence, ingratitude, quarrelsomeness, cruelty, superstition; and the latter fifteen were settled on as resultant groups, and the authors who describe them best are quoted. Bohannon[3] on the basis of _questionnaire_ returns classified peculiar children as heavy, tall, short, small, strong, weak, deft, agile, clumsy, beautiful, ugly, deformed, birthmarked, keen and precocious, defective in sense, mind, and speech, nervous, clean, dainty, dirty, orderly, obedient, disobedient, disorderly, teasing, buoyant, buffoon, cruel, selfish, generous, sympathetic, inquisitive, lying, ill-tempered, silent, dignified, frank, loquacious, courageous, timid, whining, spoiled, gluttonous and only child. Marro[4] tabulated the conduct of 3,012 boys in gymnasial and lyceal classes in Italy from eleven to eighteen years of age (see table given above). Conduct was marked as good, bad, and indifferent, according to the teacher's estimate, and was good at eighteen in 74 per cent of the cases; at eleven in 70 per cent; at seventeen in 69 per cent; and at fourteen in only 58 per cent. In positively bad conduct, the age of fifteen led, thirteen and fourteen were but little better, while it improved at sixteen, seventeen, and eighteen. In general, conduct was good at eleven; declined at twelve and thirteen; said, to its worst at fourteen; and then improved in yearly increments that did not differ much, and at seventeen was nearly as good as at eleven, and at eighteen four points better. [Illustration: Percentage x Age] He computed also the following percentage table of the causes of punishments in certain Italian schools for girls and boys near pubescent ages: