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Summary. Immotile rat, rabbit, bull and human spermatozoa, alone and in combinations, were introduced into the uteri of oestrous rats. At intervals after introduction of sperm cells, the animals were killed and the contents of each oviduct were examined for the presence of sperm¬ atozoa. The utero-tubai junction did not appear to select against the passage of foreign spermatozoa nor was motility essential for trans¬ port through the junction.

MIGRATION OF RAT AND FOREIGN SPERMATOZOA THROUGH THE UTERO-TUBAL JUNCTION OF THE OESTROUS RAT