VIKTOR HAMBURGER Department of Zoology, Washington University, S t . Louis, Nissouri HOWARD L. HAMILTON Department of Zoolo8gy and Entom2070gy, Iowa S t a t e College, Ames FORTY-FIVE FIGURES The preparation of a series of normal stages of the chick embryo does not need justification at a time when chick ernbryos a r e not only widely used in descriptive and experimental embryology but a r e proving to be increasingly valuable in medical research, as in work on viruses and cancer. The present series was planned in connection with the preparation of a new edition of Lillieâs DeueZopmerzt of the Chick by the junior author. It is being published separately to make it accessible immediately to a large group of workers. Ever since Aristotle âdiscoveredâ the chick embryo as the ideal, object f o r embryological studies, the embryos have been described in terms of the length of time of incubation, and this arbitrary method is still in general use, except for the first three days of incubation during which more detailed characteristics such a s the numbers of somites are applied. The shortcomings of a classification based on chronological age a r e obvious to
Developmental Dynamics – Wiley
Published: Dec 1, 1992
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