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Updated: May 20, 2025
The legs would naturally develop at some time or other, after a prolonged period of larval life. Feeding with thyroid causes them to develop at once. I have repeated Gudernatsch's experiment with the following results: This year I had a considerable number of tadpoles of the common English frog, which were hatched between March 26 and March 29.
I have seen no precise details of Gudernatsch's method of feeding tadpoles, but my own method was simply to put a piece of thyroid into the water containing the tadpoles and leave it there for several days, then to take it out and put in another piece, changing the water when it seemed to be getting foul. April 22. Noticed that the non-thyroid tadpoles were larger than those fed on thyroid.
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