. The eggs of mammals. Ovum; Embryology -- Mammals; Mammals -- physiology; Ovum. f Fig. 1 Fig. 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pincus, Gregory, 1903-1967. New York, The Macmillan Company

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