364 



DYNAMICS OF HISTOGENESIS. 



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Lenaihot embruo in millimeters 



Fig. 10. Curves of differential growth of descending colon. The active growth 

 of epithelial tube is contrasted with the passivity of the mesenchymal wall. An 

 absolute decrease in thickness of the mesenchymal wall is seen after the stage of 

 the 14 mm. pig embryo. 



