Abstract
1. An attempt was made to detect in the blood coming from the thyroid glands of three clogs, a physiologically active secretion, by feeding the dried blood to tadpoles.
2. One dog, whose thyroid glands were rich in colloid and had a good iodine content, yielded evidence of an active secretion into the blood collected from the glands during massage and during stimulation of the cervical sympathetic nerve. As indicated in the text this result yields no evidence of the existence of secretory nerves to the thyroid for it is not possible to know the rate of liberation of the secretion, and an increased concentration of the secretion in the thyroid blood alone can not be taken as evidence of increased liberation.
3. Two dogs whose thyroid glands were hyperplastic and contained no detectable iodine yielded negative results.
Footnotes
- Received September 3, 1918.
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