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This book follows the origin of the human skeleton back through the reptiles and amphibia to the earliest vertebrates. The author has given many years to the study of South African reptiles, including fossil forms, and on the basis of that study has marked out what he thinks is the line of human evolution. In this volume he presents only a part of the results of his work. The evolution of the soft parts will be treated in other volumes to be published later. Dr. Broom says that the vertebrates arose as animals buried in the mud of the sea floor. Because they had no need of it, they lost the exoskeleton of the invertebrates, and substituted for it an internal skeleton made by modification of the connective tissue. He believes that the visceral skull bones arose from the fusion of bony skin plates which underlay the ubiquitous teeth, and
The Origin of the Human Skeleton: An Introduction to Human Osteology.. JAMA. 1931;96(6):463. doi:10.1001/jama.1931.02720320063031