Abstract
The pre- and postovulatory phases of the menstrual cycle are as variable in length as the cycle as a whole in the macaque (Hartman).Such variability can readily be explained in a cycle controlled by a balanced system of endocrine forces.Ovulation is demonstrated on the 21st to the 23rd, 29th, 29th to the 30th, 30th, and 36th days after the onset of normal menstrual periods in a colony of healthy, mature macaques. There is evidence that such delayed ovulation occurs more frequently than these five crucial cases would indicate.Delayed ovulation in these cases was due to a postmenstrual period of ovarian inactivity.
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