File:PSM V84 D528 Facts and factors of development fig1.jpg
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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: archive.org.|
|Author||Edwing Grant Conklin after O. Hertwig and G. Retzius|
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