Bentham relates that in England the delays caused by hard-drinking couriers, who used to be heavily fined without any good result, were obviated by combining passenger traffic with the postal service. Employers of labour secure industry and the most productive work far more easily by offering a share of the realised profits than by a system of fines. In the German universities, academic jealousies and intolerance have been in great measure overcome by paying the professors in proportion to the number of their pupils, so that the Faculties find it to their interest to engage and encourage the best professors, in order to attract as many students as possible. Thus the activity and zeal of professors, magistrates, and officials would be stimulated if their remuneration depended not only on the automatic test of seniority, but also on the progress displayed by publications, sentences not reversed, settlements not cancelled, and the like. It is better to regulate the disturbing restlessness of children by timely diversions rather than by attempting to repress them in a manner injurious to their physical and moral health. So in lunatic asylums and prisons, work is a better means of order and discipline than chains and castigation. In brief, we obtain more from men by consulting their self-respect and interests than by threats and restraint <p 112> If the counteraction of punishment must inevitably be opposed to criminal activity, still it is more conducive to social order to prevent or diminish this activity by means of an indirect and more effective force. In the economic sphere, it has been observed that when a staple product fails, recourse is had to less esteemed substitutes, in order to supply the natural wants of mankind. So in the criminal sphere, as we are convinced by experience that punishments are almost devoid of deterrent effect, we must have recourse to the best available substitutes for the purpose of social defence. These methods of indirect defence I have called _penal substitutes_. But whereas the food substitutes are as a rule only secondary products, brought into temporary use, penal substitutes should become the main instruments of the function of social defence, for which punishments will come to be secondary means, albeit permanent. For in this connection we must not forget the law of criminal saturation, which in every social environment makes a minimum of crime inevitable, on account of the natural factors inseparable from individual and social imperfection. Punishments in one form or another will always be, for this minimum, the ultimate though not very profitable remedy against outbreaks of criminal activity.