DYNAMICS OF MORPHOGENESIS 



417 



Comparison of table 2, the one-fourth pieces, immediately 

 after section, with table 1, the whole worms, shows that the 

 susceptibility of the pieces is somewhat greater than that of the 

 whole animals. Susceptibility determinations twelve and twenty- 



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four hours after section show a lower susceptibility than table 2 

 but no great change occurs during this period. Table 3, forty- 

 eight hours after section, shows a susceptibility lower than that of 

 whole animals. 



