Research work by the Bureau of Human Nutrition and Home Economics Service (United States Department of Agriculture). Chief of the Bureau Dr. Hazel K Stiebeling talks about research in the field of food and nutrition at the Beltsville Research Center in Maryland. Laboratory technicians compare the nutritive value of foods. They measure the growth of a chicken using a machine, and that of a rat using an apparatus. A technician measures certain vitamins and amino acids using micro organisms in test tubes. Technicians use chemical methods to measure Vitamin C and small food proportions. A photoelectric calorimeter is used to measure carbohydrates in a food.
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