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by Dr. Wood and Dr. Freeman, assisted by graduate students of ample training and large experience in the formulation of tests. The tests were given on the same day and hour to each group in each of the twelve cities, and covered the same prescribed length of time. Xo teacher in the experiment was permitted to have any relation of any kind with any of the tests. They were not permitted even to see the test papers. A special representative of the directors in charge of the experiment was designated in each city. Either the Superintendent of Schools or one of his assistants, the Director of Research, a director of a division of instruction, or a school principal was selected to serve in this capacity. He received and administered all tests, and returned promptly all test papers written by the pupils. Comprehensive Objective test papers were reviewed and rated under the immediate supervision of Dr. Wood at Columbia University, New York City. The Topical Test papers were reviewed and rated at the University of Chicago, under the immediate supervision of Dr. Frank N. Freeman.
The results of the experiment show that the work of the film group was distinctly superior to that of the non-film group. The film group gained more than the non-film group during the twelve weeks of instruction. In General Science the average gain of the film group was in % of the average gain of both film and nonfilm groups taken together. In Geography it was 117.9 % of the average of both groups.
Not only did the film group gain more than the non-film group during the period of instruction, but the average score of the film group was higher than the non-film group at the end of the experiment, although the non-film group was superior to the film group in intelligence and grade placement, and made better scores on the tests given before the instruction began.
In General Science the average score of the film group on a test given at the end of the experiment was 1 1 1 .8 % of the average score of both groups taken together. In Geography it was 1 1 5 .6 %, of the average score of both groups.
On the essay type of test the average score of the film group