Finally it should be emphasized that cities befouled with murky smoke are at a decided disadvantage as tourist or residential places. Wealthy tourists and globe trotters go to the brilliant, resplendent, ornate, clean cities--the show places--and not to the nasty, pungent smoke producers. Even if the tourist perchance does come to a dirty town he will rarely tarry there for any length of time. Few towns which tolerate the smoke nuisance can hope to compete for tourist trade. The loss in tourist trade caused by preventable smoke in manufacturing cities represents an enormous economic loss to the trades and professions of those cities. Not only so, people looking for a city residence will not seek centers reeking with smoke. Retired people of wealth will prefer the smoke-free cities of culture and art where they can inhale the uncontaminated, invigorating ozone of sun-kissed skies. Summary of Conclusions I. The injurious organic effects exerted by smoke on human beings are both direct and indirect. The direct effects are due to the injury caused by the smoke contents themselves, while the indirect effects arise from meteorological changes produced by atmospheric smoke. II. The mental effects of smoke and smoke-produced weather states are likewise both direct and indirect. The indirect effects issue from bodily changes produced by smoke or smoke-produced weather states, while the direct effects are due to the influences of the mind’s own states upon its subsequent thoughts, disposition and conduct. III. Smoke fills the atmosphere with acrid, poisonous compounds and soot particles which may serve as carriers of the obnoxious products of human fatigue, which irritate the sensitive membranes of the eyes, nose, throat, lungs and gastro-intestinal tract, increase the susceptibility of gastro-intestinal, pulmonary and naso-pharyngeal disorders, diminish the potential reserve, working capacity and well being of the individual, increase fatigue, irritability and malcontent, and may tend to hasten premature decay. IV. Smoke lessens the duration and intensity of sunshine, reduces the intensity of daylight, the limit of visibility and the diurnal winter temperature; increases humidity, mists, the frequency and duration of fogs and possibly alters the electrical potential. V. Sunshine is an important bio-dynamic agent. It promotes anabolism, transpiration and perspiration, and increases the percentage of hemoglobin. The blue and ultra-violet rays of sunshine exert a bactericidal effect on pathogenic bacteria, and a tonic, vitalizing influence upon the human organism. Sunshine exerts an exuberant influence on the feelings. Moreover, colorless daylight is superior for visual efficiency, optical health and affective quality.