424 



C. M. CHILD 



of Lot 1 while Lot 3 has not yet fully recovered and its suscepti- 

 bility is about the same as that of Lot 1. 



After twenty-four hours further recovery has occurred and after 

 forty-eight hours (table 7) the susceptibility of Lot 2 is lower 

 than that of Lot 1 and that of Lot 3 slightly lower than that of 

 Lot 2, that is, the original axial gradient of the whole worm has 

 now reappeared in the relative susceptibilities of the pieces. 



xA.s reconstitution proceeds, the susceptibility of all the pieces 

 rises and since the more posterior regions of the first zooid undergo 

 more reorganization than the anterior regions in giving rise to a 

 new individual, the susceptibility of the posterior pieces rises 



TABLE 8 



Susceptibility to KCN 0.001 m. of one-sixth pieces one hundred and tvjenty hours 



after section 



