It is not sufficient to bar the seaports of a country against infectious physical diseases. The greatest need of quarantine is against germs of disorder that originate within the gates. Quarantine can never be partial, for, unless complete, it ceases to be quarantine. Quarantine means, in brief, exclusion--keeping without the gates. There are gates, however, other than seaports, and germs of pestilential contagious disorders other than the bacilli of smallpox or yellow fever. Social Quarantine and Moral Quarantine are even more essential for the protection of communities and individuals than quarantine against epidemics of imported physical sickness. Quarantine is less expensive than correction. All languages have a proverb similar to the Anglo-Saxon, "An ounce of prevention is better than a pound of cure." Centuries of experience with quarantine, and occasional neglect of it, have demonstrated that the smallest neglect may engender endless mischief. * * * * * Why not profit by this experience in dealing with all questions of social and individual concern? Why not adopt social and moral quarantine with the same thoroughness of aim in order to escape the evils of ignorance, waste, poverty, fear, worry and unhappiness when we know that these disorders are more harmful to a people than the most virulent imported diseases? Moral and Social Quarantine are the bases of all forms of prevention and protection. They guard against ignorance and thereby insure the wisdom that institutes other branches of quarantine which throw a cordon of protection around society. Social quarantine stimulates and embraces moral quarantine. Seaport quarantine is maintained only while the _last_ microbe is prevented from entering the gates. Social quarantine must extend its protection to every growing human life in a community during the period of its growth, and influence the formation of its character, in order to be signally effective. It must reach the _last_ waif with its loving care. Reaching the _last_ waif necessitates reaching _all waifs_, and that constitutes, and must be the aim of, Perfect Social Quarantine. The character of the _last_, or _least_, unit of a nation is a vital test of the strength and consistency of a nation. * * * * * Society is indebted to the mother instinct of the race for the finest expressions of its character. The functions of social quarantine are clearly within the province of maternal care. The first necessity of social quarantine is to protect the dawning intelligences of children against evil or false impressions by furnishing ample facilities for gaining wholesome suggestions, so that good ideas shall dominate the mind and leave no room for the assimilation of harmful impressions.