BRAIN REGENERATION IN AMBLYSTO.MA 211 



results in the formation of a curtain across the interventricular 

 foramen derived from the epend\nna lining the neural tube. 

 If, on the other hand, the forebrain is removed without remov- 

 ing the end organ, the nasal placode, the presence of the latter 

 acts as a stimulus to the regeneration of a new telencephalon 

 through the ingrowth of the olfactory nerve. The pallial re- 

 gion of the telencephalon is regenerated in all cases owing to 

 the stimulus afforded by the forward growth of axonos from 

 lower centers in the brain and cord. 



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