It should be the part of the physicians to take pains to advise, for most of our people are accessible to ideas; yet from these can come no improvement until the people are convinced that it is needed. Just as soon as the individual fully realizes that he himself is to blame for his suffering or his poverty in human energy, he will apply his intelligence to the bettering of his condition. If he can, in a short time, make as good a showing as public effort has made in the case of water supplies, he will accomplish much for the race. Of equal importance to food, in the proper care of the human machine, comes the air we breathe. Many of man’s present physical troubles are due to the roof over his head confining the warmed, used-up air, which would escape freely if there were an opening provided. The first law of sanitation requires the quick removal of all wastes. Once-breathed air is as much a waste as once-used water, and should be allowed to escape. Sewers are built for draining away used water. Flues are just as important to serve as sewers for used air. Air is lighter than water, and out-breathed air being warmed is lighter than that at room temperature. It rises to the ceiling, where it will escape if it is allowed to do so before it cools sufficiently to fall. The roof also keeps out sunlight, and some late investigations indicate that glass cuts off some of the most vitally important light rays. The “glame” of the Ralstonites--“air in motion with the sunlight on it”--may have a scientific basis. It will at once be retorted, “But we cannot heat all out-of-doors.” A partial reply is: Do not try to make your house a tropical jungle. Travelers assure us that such an atmosphere is not conducive to work or to health. All great nations have lived in a temperate climate, where physical and mental activity was possible for many hours a day. Science is more and more clearly giving reasons for the cooler temperature in certain physiological laws. The habits of life in regard to air and food are largely under individual, or at least under family control, and should be studied as personal hygiene. The lessons being so clearly taught in the treatment of tuberculosis should be heeded in forming the general living habits of the people. If loss of life can be lessened and working power increased by man’s effort, why does he not make the effort? Why are men and women so apathetic over the prevalence of disease? Why do they not devote their energies to stamping it out? For no other reason than their disbelief in the teachings of science, coupled with a lingering superstition that, after all, it is fate, not will power, which rules the destinies of mankind.