On the other hand, the attendance in one place of so small a number as one hundred would hardly justify the work of planning and carrying out a tour unless either the small group are carefully selected as leaders capable of passing on the information to others, or the community is so small that this number is as many as might be expected. It ought to be possible to estimate in advance, or at least after the first week of the tour, the length of time required for the average person to see all that is important for him to see and understand. With this period in mind it is possible to estimate the number of people who can be handled in a given length of time. For example, we may assume the following conditions: A train of three cars. Number that can be accommodated comfortably in each car at one time, 60. Twenty minutes, required time to see the exhibits or hear and see demonstrations in each car, or one hour for the train. Train on view six hours. Maximum attendance practicable during the stop, 1,080 people. The attendance is, of course, never distributed so evenly as this over the day, and all the visitors do not stay exactly the same length of time. Probably with a fairly even distribution a train with a maximum capacity of one thousand will handle satisfactorily about eight hundred people. An estimate of the rate at which visitors may be passed along will be found exceedingly useful in deciding many questions, such as the arrangement and content of the exhibits, the length of time to continue a demonstration, the number of times to repeat it, the length of the stay, and the quota of attendance to work for in the advance publicity. For example, would you rather have fewer people and have those who come stay longer, or would you prefer having a larger attendance with those who compose it spending less time with you? The selection of exhibits and the program should be arranged according to your decision on these points. If you are giving a few people detailed information which it would serve your purpose better to give to a larger number, you are throwing away your opportunity for want of a little careful calculation. The mistake most frequently made is to plan exhibits and programs on the expectation of having each visitor spend a long time at the train carefully examining each display, and then when the people arrive, to pass crowds through quickly without giving them a chance to see what has been prepared for them. DISTRIBUTING THE ATTENDANCE