Children accompanied by their teachers enter cafeteria by grades and secure plates of food served from steam table. Dr. Hathaway (at far right) is taking sample plates, selected at random, as they are prepared for children, to be checked for nutritive value by chemical analysis. An average sized serving of each food is determined by averaging the weights of five samples in this way. School lunch study by U. S. Bureau of Human Nutrition and Home Economics Cumberland, Maryland

Day of month is estimated.