Excerpt from Human Embryology and Morphology
The issue of a new edition has given the author an opportunity not only of incorporating recent additions to our knowledge of the development and morphology of the human body, but also of recasting many of the chapters. Over eighty new illustrations have been added. The chief alterations relate to sections dealing with the origin of the foetal membranes, the growth of the embryo and foetus, and the nature of the basal ganglia of the brain. The chapters dealing with the pharynx, the ear, the heart, and the lymphatic system have been rearranged and to a large extent rewritten. The enquiries of the late Professor Franklin P.Mall have shown that human embryos, in their earlier stages, are a week older than was formerly believed. The estimated ages of embryos now given in this work are based on Professor Mall's calculations.
Experience has confirmed the author in his earlier opinion that the facts of embryology are barren and meaningless until they are interpreted in the light of our knowledge of the evolution of the human body - a knowledge which must be founded on a comprehensive survey of comparative anatomy and physiology. Hence in this new edition the author has sought to give, not only a descriptive history of the development of the various systems of the body, but to make the facts intelligible by bringing a knowledge of comparative anatomy and evolution to bear on them.
Human Embryology and Comparative Anatomy have become vast fields of knowledge. Here they are dealt with only in so far as they bear directly on the nature of the human body, and reflect what the author has found to be useful in the course of his daily work and teaching. Every effort has been made to make the book representative of the latest British Research.
In the preparation of the present edition the author has become indebted to a very wide circle of friends too numerous to be mentioned individually. He cannot, however, allow the occasion to pass without a warm acknowledgment of his indebtedness to Dr. Alexander Low, Lecturer on Embryology in the University of Aberdeen, for the help he has given.
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