Looking backward over the methods used to decrease the spread through the use of public conveyances, it seems that the following procedures have the best claims for retrial: (1) Placarding the cars. This appeared to reduce the amount of coughing and sneezing, even in face of the fact that the cars were unusually draughty and chilly. (2) The adoption of the “stagger-hour” system where the practice is feasible. (3) The instruction of the people to use the street cars as little as possible. _Enforcement of Anti-Spitting Ordinances_ All street cars and trains carry anti-spitting notices either to the effect that spitting will be prohibited on penalty and fine and imprisonment, or giving stated amounts of the fine. Yet spitting is constantly indulged in in these places and one rarely sees or hears of the enforcement of the law. If the ordinance was worth making a law, it is certainly worth enforcing, and yet there is probably no law so flagrantly broken. Ordinary police officers pay no attention to the enforcement of the spitting ordinance and have been known to refuse to even reprimand spitters. The incident of a sanitary officer wearing a uniform and a cap, indicating to the public his official position, who was seen sitting in the smoking car in a local suburban train and spitting profusely on the floor has been recounted on very reliable authority. Another incident is known in which a street car conductor was asked by one passenger to stop another who was expectorating abundant mucoid sputum upon the floor. The conductor replied that he had orders not to notice such things. It is no wonder that people are indifferent to such impotent measures. Whether it is possible to convey epidemic influenza or not by means of sputum, it is certain that tuberculosis is spread in this way, and that influenza predisposes to tuberculosis and causes old healed tuberculous foci to become active. People should be made to understand that they may have tuberculosis without knowing it themselves, and that by spitting it may be transmitted to other persons. Spitting by persons aware that they have tuberculosis is criminal negligence and such persons should undoubtedly be prosecuted. If a person knows that he has tuberculosis and deliberately spreads about the infection so that other persons contract the disease and die from it, he is directly responsible for the deaths. It would be hard to imagine trying to control manslaughter committed in any other way by merely putting up signs in conspicuous places forbidding the act. The average boy acquires the spitting habit between the ages of 8 and 12 years, and in many instances carries it to the grave. The one possible way of stopping spitting seems to lie in teaching the dangers of it to children, beginning in the kindergarten and emphasizing it throughout the child’s education. It is possible that in this way spitting may become obsolete in two or more generations.