1 An experimental research on the effects of instructional media to the formation of scientific concept "environment" was carried out with 695 pupils from ten to fifteen years old. 2 Sixteen items were selected as material. (1) interchange, (2) steam-power plant, (3) sewege treatment,(4) mine, (5) incinerator, (6) car, (7) super-express train, (8) paper mill, (9) petroleum industry combinate, (10) cleanser, (11) exploitation, (12) agricultural medicine, (13) plastic, (14) ham & sausage, (15) air-plane, (16) pollution 3 Letter, sound and slide-photograph were adopted as instructional media, then three experimental classes were established. A class: the item was presented through letter. B class; the item was presented through letter and sound. C class; the item was presented through three modia. 4 Pupils wrote their image on the paper as word, phrase or sentence during item presentation for two minutes. 5 Five categories were induced from the analysis of pupil's description. (1) item itself, (2) phenomenon, (3) use, (4) place, (5) the others 6 Numbers of image description per a pupil did not necessarily increased in proportion to its age. 7 Numbers of image description per a pupil took the highest order at B class. This seems to suggest that sound was more effective than other media to increase image description. 8 The close connection was found between the following media and categories. (1) letter-item itself, (2) sound-place, (3) slide-phenomenon.
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