tendency toward chronic criminal behaviour leading to numerous arrests and re-imprisonment. Studies of the yearly intake of prisons, reformatories, and jails in the United States and Europe show that from one-half to two-thirds of those imprisoned have served previous sentences in the same or in other institutions. The conclusion is that the criminal population is made up largely of those for whom criminal behaviour has become habitual; moreover, penal institutions appear to do little to change their basic behaviour patterns.

Though the percentage of recidivists runs high for all offenders, it is greatest among those convicted of such minor charges as vagrancy, drunkenness, prostitution, and disturbing the peace. These are more likely than serious criminal charges to result from, and to be bound up in, an entire way of life. Accordingly, their root causes are rarely susceptible to cure by jailing.