File:Morgan 1925 fig05.jpg

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Fig. 5. Legs of Five Mammals

Drawn to scale, to show homologous parts. (After Leconte, from Romanea.)

The legs of man, monkey, dog, sheep, and the horse are made up of similar bones (fig, 5) . The same parts are found in the leg of the lizard, the frog, and, even though less certainly, in the fins of fishes. Comparison does not end here. We find similarities in the skull and backbones of these same animals ; in the brain ; in the digestive system; in the heart and blood vessels; in the muscles.

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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Morgan (1925) Evolution and Genetics: 1 Different Kinds of Evolution | 2 Four Great Historical Speculations | 3 Evidence for Organic Evolution | 4 Materials of Evolution | 5 Mendel's Two Laws of Heredity | 6 Chromosomes and Mendel’s Two Laws | 7 Linkage Groups and the Chromosomes | 8 Sex-Linked Inheritance | 9 Crossing-over | 10 Natural Selection and Evolution | 11 Origin of Species by Natural Selection | 12 Non-Inheritance of Acquired Characters | 13 Human Inheritance | Figures


Morgan, T. H. (1925). Evolution and genetics. Princeton: Princeton University Press.

Cite this page: Hill, M.A. (2019, July 19) Embryology Morgan 1925 fig05.jpg. Retrieved from

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