Excerpt from The Development of the Human Body: A Manual of Human Embryology
The increasing interest in human and mammalian embryology which has characterized the last few years has resulted in many additions to our knowledge of these branches of science, and has necessitated not a few corrections of ideas formerly held. In this fourth edition of this book the attempt has been made to incorporate the results of all important recent contributions upon the topics discussed, and, at the same time, to avoid any considerable increase in the bulk of the volume. Several chapters have, therefore, been almost entirely recast, and the subject matter has been thoroughly revised throughout, so that it is hoped that the book forms an accurate statement of our present knowledge of the development of the human body.
To several colleagues the author is indebted for valuable suggestions, and in this connection he desires especially to thank Dr. J. C. Watt for much generous assistance in the revision of the manuscript and for undertaking the correction of the proof-sheets.
In addition to the works mentioned in the preface to the first edition as of special value to the student of Embryology, mention should be made of the Handbuch der vergleichenden und experimentellen Entwicklungslehre der Wirbeltiere edited by Professor Oscar Hertwig and especially of the Manual of Human Embryology edited by Professors F. Keibel and F. P. Mall.
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