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on the sphincters in the arteries of the thyroid glands of some rodents (albino rats, mice, rabbits and hamsters), the author extended some additional observations on the same gland of guinea pigs. Peculiar structures such as the localized thickening of the intima '38) have been reported to be found at the branching points of the arteries in human thyroid glands. Sob ott a ('15) pointed out the presence of the bud in dogs and cats also. Petersen ('25) designated a transitional portion from artery to capillary, which shows a similar structure, as the ' Knospenarterie'. Recently, the cushion which occurs at the junction of an arterial trunk and its branch was found in dog thyroid glands (Modell, '33). Furthermore, the observation of lip-or sphincter-like structures at the branching points of arteries in human and dog thyroid glands was added by Kux ('35). Not all agree regarding the histological aspect of these structures. The localized thickening of the intima is produced by the proliferation of connective tissue (Isenschmid, '10). Bargmann ('39) explained it as a precursor of pathological change of blood vessels. Concerning the structure of the arterial bud, some (Sobotta, '15) described it as being formed by the thickening of the intima, others '36) considered it to be a localized proliferation of endothelial cells and still others

On the Sphincter in the Artery of the Thyroid Gland of the Guinea Pig