reported the preparation of crude alcoholic eXtracts of horse testes which possessed a marked oestrogenic potency. Extracts obtained in this way were three hundred times as active oestrogenically as those prepared from a similar weight of mares' ovaries. The high oestrogenic potency of horse testes extracts has been confirmed by later workers. The present investigation was undertaken in order to isolate and identify the oestrogens responsible.
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Desmond Beall (1940) studied this question.