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Updated: May 27, 2025
The subject is still hidden in darkness to the extent of insufficient knowledge on our part of the exact constituents of the active agents in the secretions of the testes, thyroids, suprarenals, pituitary and other glands.
This clinical observation is strikingly confirmed by laboratory observations; normal rabbits subjected to fear showed a rise in temperature of from one to three degrees, while two rabbits whose thyroids had been previously removed and who had then been subjected to fright showed much less febrile response.
But it has been proven that they are separate, individual glands, with a structure and function of their own, and a definite importance to the body economy. On the animal family tree they appear early, contemporaneously with the thyroids. In the embryo they develop from about the same sites.
A French study of over four hundred idiotic children with normal thyroids reported that over three fourths had no thymus at all. Everything points to the most direct and close relation between the gland and nutrition and growth, but with nothing tangibly definite like our knowledge of the thyroid and the pituitary.
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