Fertilizing capacity of spermatozoa deposited into the Fallopian tubes.

Discovery that maturation of the sperm in the mammalian female tract is a necessary step in reproduction. This was co-discovered and called capacitation by Austin in the same year. See C.R. Austin, Observation on the penetration of the sperm into the mammalian eggs. Aust. J. sci. Res., 1951, B4, 581-.