The new doctrine will interest the selling department, who act as intermediaries between the manufacturing department and the public who is to buy the product. It will be a real part of the preliminary work in adjusting such conditions as lighting to take the sales department and purchasing department into conference on the subject. Let all interested see that nothing comes into or goes out of the plant until the question, “What is its relation to fatigue?” has been considered. We forget sometimes that a thing may have value not only because it has certain qualities that eliminate fatigue, but also because it lacks certain qualities that would cause fatigue. Go, then, through your own plant with the question of glare in your mind. Examine and inspect every work place, and see what can be done. Not only for reasons of glare, but for other reasons we recommend that every work place should be inspected for unnecessary fatigue by having a man, competent in fatigue study, actually sit and stand in the working position in each and every work place in the establishment once every three months during the installation period, and not seldomer than once per year thereafter. Sometimes it will be found that moving the nearest light or shading a distant light will be all that is necessary. Sometimes a coating of dull black paint on some of the working equipment is required; sometimes the substitution of a dull-finished for a glossy paper. Sometimes dull-coloured blotting paper can be laid upon the place where the reflected glare comes. Perhaps a dull finish upon that would not only save the time of your workers, but also those who are to use the product after it leaves your hands. The world worked a great many years under the motto, “Give the public what it wants.” We are beginning to realize to-day that the public will want just exactly what it is educated to want; also that the public is easily educated if the arguments that are used are based upon measurement, and are presented in attractive form. The lighting problem is but a small element of the problem of eye fatigue. This will, however, be left for later consideration. The Heating, Cooling, and Ventilating Problem.