DYNAMICS OF MORPHOGENESIS 



121 



J- 



\1 



i8 



^9 



21 



23 





20 



22 



24 



Figs. 18 to 24 Effect of ether on regulation. Figure 18, diagrammatic, indicat- 

 ing levels of section. Figures 19 and 20, pieces including the region between levels 

 I and 2 in figure 18: regulation in 0.4 per cent ether. Figures 21 and 22, pieces 

 including region between levels 3 and J^ in figure 18 : twelve days in ether. Figures 

 23 and 24 similar pieces after eighteen days in ether. 



