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Fig. 1. A nearly ripe human ovum in the living condition. The ovum is surrounded by a series of follicle cells (FC) inside of which is the clear membrane (Memb.) and within this is the ovum proper containing yolk granules (Y) and a nucleus (N) embedded in a clear mass of protoplasm. magnified 500 diameters (x 500). From O. Hertwig. B, two human spermatozoa drawn to about the same scale of magnification. (After G. Retzius)

Source Edwin Grant Conklin: Facts and factors of development. The Popular science monthly, Volume 84, p524. New York, Popular Science Pub. Co., June 1914. Online:
Author Edwing Grant Conklin after O. Hertwig and G. Retzius
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1924.

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