. Contributions to embryology. Embryology. 4 W= is-:-' 11 12 13 Duesberg fecit • jo * 14 / / 10 \hh. 15 rt \ \ ^ lb. 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 Carnegie Institution of Washington. Washington, D. C

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