Occasionally two or three topics may be presented on the same train by having separate cars for each topic and a separate audience for each. Thus, on one train a car containing household labor-saving devices was designed to interest the wives of farmers, and a pure-seed car the farmers. Or several topics may be combined in such a way that they are made parts of one large idea. Health topics might be brought together under “The Health of the Family,” and divided into instruction about the care of the baby, the child at school, the teaching of social hygiene to older boys and girls, and the sanitation of the household. But even when thus closely related to the family interests of the visitors, this group of topics is still too varied to permit any one to make a strong and lasting impression. WHAT TO TELL Having chosen a topic, there is sure to be so much to tell about it that careful selection again becomes necessary. The best guide in preparing the subject matter of the program is the visualization of expected audiences already referred to. It cannot be too strongly emphasized that the relation of the subject matter to their interests, circumstances, and habits will largely determine their response to the suggestions given. Often this relationship exists, but is not explained clearly enough to be readily understood. The fact that the traveling campaigners come from a distance, bringing new ideas expressed in an unfamiliar way, leads an audience to look upon the whole project as something which is no doubt very interesting to see and hear about, but of no immediate concern to themselves. It is worth while to make a very special effort to overcome this attitude of aloofness and to make the audiences see that what you are bringing is something that they have been wanting all the time, without their fully realizing it. [Illustration: GROUP OF OBJECTS EXPRESSING ONE IDEA A conspicuous title sign holds together a number of objects and captions illustrating one idea. The exhibit gains greater unity and separation from other exhibits by being enclosed on three sides.] MAKING UP THE PROGRAM The term program is used here to include the combined activities and displays that make up what is presented to visitors at each stopping point. It may consist of music, talks, demonstrations, motion pictures, or displays of posters and objects, or several of these features combined, with varying emphasis on one or the other form. It may be held inside of railroad cars or in an open space, using for a stage a flat car, the rear platform of a passenger car, or a temporary structure. Or it may be given in a hall in the town. Sometimes the program includes both indoor and outdoor features.