“But how can it be shown,” asks the reader, “that these injudicious penal systems are inequitable? Where is the method which will enable us to say what kind of {163} punishment is justified by absolute morality, and what kind is not?” These questions we will now attempt to answer. * * * * * So long as the individual citizen pursues the objects of his desires without diminishing the equal freedom of any of his fellow citizens to do the like, society cannot equitably interfere with him. While he contents himself with the benefits won by his own energies, and attempts not to intercept any of the benefits similarly won for themselves by others, or any of those which Nature has conferred on them; no legal penalties can rightly be inflicted on him. But when, by murder, theft, assault, arson, or minor aggression, he has broken through these limits, the community is warranted in putting him under restraint. On the relative propriety of doing this we need say nothing: it is demonstrated by social experience. Its absolute propriety not being so manifest, we will proceed to point out how it is deducible from the ultimate laws of life. Life depends on the maintenance of certain natural relations between actions and their results. If respiration does not supply oxygen to the blood, as in the normal order of things it should do, but instead supplies carbonic acid, death quickly results. If the swallowing of food is not followed by the usual organic sequences—the contractions of the stomach, and the pouring into it of gastric juice—indigestion arises, and the energies flag. If active movements of the limbs fail in exciting the heart to supply blood more rapidly, or if the extra current propelled by the heart is greatly retarded by an aneurism through which it passes, speedy prostration ensues. In which, and endless like cases, we see that bodily life depends on the maintenance of the established connexions between physiological causes and their consequences. Among the intellectual processes, the same thing holds. If certain impressions made on the senses do not induce the appropriate muscular adjustments—if the brain is clouded with wine, or consciousness is {164} pre-occupied, or the perceptions are naturally obtuse; the movements are so ill-controlled that accidents happen. Where, as in paralytic patients, the natural link between mental impressions and the appropriate motions is broken, the life is greatly vitiated. And when, as during insanity, evidence fitted, according to the usual order of thought, to produce certain convictions, produces convictions of an opposite kind, conduct is reduced to chaos, and life endangered—perhaps cut short. So it is with more involved phenomena. Just as we here find that, throughout both its physical and intellectual divisions, healthful life implies continuance of the established successions of antecedents and consequents among our vital