. Chemical embryology. Embryology. ,.-Of|j^ â â ^afet-. Fig. lOO. Physiological gradients in the egg of the lamprey (Hyman). 1-4. Unfertilised egg. 5-8. Four-cell stage. 9-12. Eight-cell stage. 13-18. About thirty-two-cell stage, 16 hours. 19-22. Morula, 20 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 Needham, Joseph, 1900-. New York: The MacMillan Co.

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Keywords: ., bookcentury1900, bookpublishernewyorkthem, booksubjectembryology