Abstract
The number of primordial follicles and the relative number of growing follicles at the earliest stages of development were detd. in the ovaries from 10 newborn infants by a mathematical method elaborated by the author. The large follicles were not counted, their number being only estimated. The avg. number of primordial follicles in 7 full term cases was 733,000. The percentage of growing follicles in ovaries containing Graafian follicles was higher than in those in which this type of follicle was absent. These findings substantiate the author''s observations made in earlier investigations that all types of follicle respond to stimulation by gonadotropins.