Abstract
Two litters of white rats were divided, half of each being placed in a separate cage. They were all fed the following diet: 53 parts oats, 25 parts patent flour, 20 parts linseed meal, one part calcium phosphate and one part sodium chloride. In one cage the rats were given distilled water to drink, and the other, water containing 0.1 mg. of iodine per liter. Two rats on each diet were killed after 4 weeks and the weighing of the thyroid completed within 7 minutes after death. This process was repeated every 2 weeks until all had been killed. The following table shows the thyroids to be doubled in size in rats not receiving iodine:
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