Studies on the dynamics of morphogenesis
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Child, C. M.
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Article
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1914
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John Wiley and Sons
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English
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## Hull ZoBlogical Laboratory, University of Chicago T W O FIGURES In earlier papers (Child '11 b, '11 c, ' 11 e) attention has been called to the fact that the frequency of head-formation in isolated pieces of Planaria dorotocephala varies with size of piece, region of body and various external c