Biological Symposia, Volume XII. Estimation of the Vitamins

alone and together, upon total heat production of normal rabbits, thryroidectomized rabbits, and thyroidectomized rabbits treated with thyroxin. Data so obtained were then supplemented with results of clinical studies, and from the whole, conclusions were drawn which are convincing, both because of the straightforward nature of the experiments themselves and the logical, orderly manner in which they are presented. The phenomena dealt with here in particular, the metabolic actions of epinephrine, its relation to thyroid activity, and interrelationships between hormones and vitamins-have all claimed the attention of American investigators within recent years. Consequendy, this little monograph will interest those who study endocrine physiology and nutrition, as well as physicians who care for patients with hyperthyroidism. JOHN R. BROBECK