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Types of Visual Aids and Their Uses 47
were held with librarians, visual directors, and historians covering the high points of each period — it was unanimously decided that the minimum number required was fifteen; that, in addition, a concise introduction was necessary to lay the proper background with a text under each to accentuate the principal points and broaden the subject; and for classroom use, a teacher's question guide to aid in bringing out a wide discussion."
Sets of the pictures are available, also, in easel-type bound volumes, prepared especially for the reading table in school or public libraries. In addition to preparing the sets of pictures and accessory materials for classroom and library use, Photographic History Service is now offering the same sets in glass slide form, accompanied by suitable explanatory material and other teaching aids.
Geographical Pictures. Anotner excellent series of pictures prepared especially for school use in the teaching of geography is offered for distribution by the National Geographic Society. The various pictures are grouped into what is known as the Pictorial Geography Series, including the following divisions: No. 1. Eskimo Life, and Sahara Life (48 pictures) No. 2. The Indian in America, the Negro in Africa (48 pictures) No. 3. Life in China and Hill Tribes of the Philippines (48 pictures) No. 4. Land, Water and Air (48 pictures) No. 5. The United States, General (48 pictures) No. 6. Italy (48 pictures)
The pictures have been selected from the various issues of The National Geographic Magazine, so vary in size. However, the pictures and accompanying descriptive material are printed together on lightweight cards, 9 x 11 inches in size. The sets are available at very reasonable cost.
The descriptive material which accompanies each picture is prepared in simple language, so it may be read with understanding by pupils in the earliest geography and nature study classes.
In addition to this service, the National Geographic Society offers color sheets reproduced from various issues of the magazine, covering nearly every country in the world. These color sheets are printed on the usual magazine paper stock and are excellent for mounting purposes. In many cases there will be pictures on both sides of the sheets, so it will be desirable to order two copies or sets of each. The color plates are furnished at thirty cents for forty-eight sheets, or at fifty cents for ninety-six sheets, to be selected in small groups from a very large list of available subjects.