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Smith and Schuster found that castration at other seasons caused the pad to remain in the condition in which it was at the time, that there was no reduction or absorption as Nussbaum and Meisenheimer found, and that allo-transplantation of testes that is, the introduction of testes from other frogs either into the dorsal lymph-sacs or into the abdominal cavity or the injection of testis extract, had no effect in causing growth or development of the thumb-pad.
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