Abstract
Summary .If œstrogenic material is administered to sexually immature possums (Trichosurus vulpecula), testes and epididymes show a tendency to leave the scrotum and to become situated under the skin near the abdominal ring. This process, which is called testicular ascent, was rapidly completed in a young animal of about Ave and a half months of age. In older but still immature animals, the process is slower and requires larger or lethal doses of cestrogenic material. In mature adult animals the testicles were confined to the scrotum, even after large doses of œstrin.
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