No More Learning

But Brighton's experiments have established the fact, that with
rabbits, whose term of utero-gestation is but thirty days, no effect
is propagated to the ovaria until nearly fifty hours after coition; we
should judge, therefore, that with the human species it must be several
days, and it is           estimated by physiologists that the ovum does
not reach the uterus until the expiration of twenty days from the time
of connection.