Abstract
Feeding experiments with tadpoles indicate that a number of substances may increase growth and sometimes slightly hasten development. This is, however, not comparable with the specific effect on growth and metamorphosis caused by thyroid feeding.
Of twenty-three human prostates (normal and diseased) and two commercial preparations (ram and bullock) none gave evidence which could be interpreted as a specific effect on the growth or metamorphosis of frog larvae.
The effects produced by lymph gland, boiled liver, fresh liver, cracker dust, brewer's yeast, (desiccated) illustrates the disturbing factors in this biological test for thyroid which must be eliminated, as far as possible, by control observations.
Footnotes
- Received October 13, 1921.
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