Experiments on female ovary, oviduct and uterus removal. Shown are the positions of eggs in the uteri after unilateral ovariectomy (A), after unilateral ovariectomy and the connection between oviduct and uteri bound at the side with the still present ovary (B), unilateral ovariectomy and the oviduct and uterus at the side of the still present ovary removed (C) and the unilateral removal of the oviduct and the uterus without ovariectomy (D). The red cross indicates the ovary removed, the red lines indicate positions where either oviduct (B) or the uterus (C and D) were bound. The two-headed arrow with the two red lines indicates that eggs apparently do not wander from one uterus to the other passing the common tube. Redrawn after Xavier (1971).