Guinea-pigs were from the colony at the Institute. Examination of the animals and operative and histological techniques were the same as in previous work (Deanesly, 1967).
In the first group (Table 1, Group 1), one uterine horn was removed from four females; one of these failed to mate and another had no corpora lutea on the side of the sterile horn. Such animals are omitted from Table 1. For Group 2, a small piece of one Fallopian tube was removed without disturbance of the vascularization of the uterus or ovary, and for Group 3 one uterine horn was severed or ligatured near the middle. Ovaries were sectioned serially at 7 μ after fixation in Bouin's fluid, and one in six sections were mounted. Two diameters at right angles were measured ( × 27) across the largest sections of each corpus
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