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    Aristotle and the Chick Embryo.O. D. Kember - 1971 - Classical Quarterly 21 (02):393-.
    AT Historia Animalium 561b27, during the course of his account of chick embryology, Aristotle notes : . D'Arcy Thompson translated this passage as follows: About the twentieth day, if you open the egg and touch the chick, it moves inside and chirps, and it is already coming to be covered in down when, after the twentieth day is past, the chick begins to break the shell.
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    Aristotle, De Generatione Animalium 761b35.O. D. Kember - 1972 - The Classical Review 22 (02):172-173.
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