Field and Laboratory

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The discovery by Gudernatsch (53) of the role of the thyroid in the control of metamorphosis in amphibia quickened interest in this field, with the result that an overwhelming number of papers has appeared since 1912 on the thyroid gland and its functions in amphibia and other cold-blooded vertebrates. Much of the literature has been reviewed elsewhere (75), and a complete analysis of all the publications will not be attempted here. The present review concerns, primarily, those papers dealing with the thyroid gland of Necturus; as also, secondarily, some papers treating of other animals, which were important in the development of our present understanding of thyroid function in Urodela.

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