Another consideration in arranging material is that groups relating to one subject should be so placed that their relation to one another and to the whole be quickly recognized. Sometimes exhibits that belong together are separated because variety of size and shape makes it inconvenient to work out a suitable arrangement. It is worth while to plan carefully in advance the kinds of exhibit material that will harmoniously illustrate a given topic; also to have the sizes and shapes conform to the dimensions of the space reserved for them. SOME OBSERVATIONS FROM PRACTICAL EXPERIENCE In a letter describing the exhibit car of the Canadian Forestry Association, Mr. J. R. Dickson, who was in charge of the car, makes some interesting observations regarding the arrangement of exhibits based on his experiences. He writes in part as follows: The people, especially at crowded hours, all tend to travel through an exhibit car in one direction and this is very desirable inasmuch as the man in charge of the car can regularly escort through it group after group of eager sightseers or inquirers after knowledge and keep up a cross between a lecture and a conversation with them, answering their questions and drawing their attention to all the pertinent points in the exhibit which they might otherwise overlook. To accomplish this plan of car lecturing most effectually, the entire exhibit should be arranged so far as possible in a natural sequence, beginning at one end of the car and ending at the other. This of course is where a single aisle is provided down one side of the car. Such a scheme makes one’s talk logical and so helps to impress the lessons of the exhibit in such a way that they are remembered easily and intelligently.... On entering the car the first object to attract the visitor’s eye was a large map of Canada, showing the forestry belt of 400,000,000 acres, over 90 per cent of this timber land being publicly owned. When told that each citizen of Canada, man, woman and child, owned on the average fifty acres of this national resource, the imagination and the pocket-nerve of the visitor were at once stimulated and he or she was thereafter taking a personal interest in the whole exhibit. The visitor next turned to a nursery of small pine and spruce illustrating the essential beginning of all our forest wealth and also suggesting the basic importance of land classification in order that every acre may be put to its best use. Then our modern methods of protecting both such young growth and the resulting mature timber were examined and explained, and the great need for good laws and the generous expenditure of public money in order to safeguard their forests, was readily seen and agreed to....