DAVID L. CLAYBROOK 



237 



B 



"^^h 



1.0 

 0.8 

 0.6 



hydro 



(Average of 



9 Replicates) 0.4 



0.2 







I 2 4 6 8 10 20 30 



^^/hydro 

 Fig. 2. Budding response to injected fractions. 



logarithm of the dosage in some cases, while in the other experi- 

 ments log responses were not observed. 



The relative potencies of some natural materials showing ac- 

 tivity in this system are listed in Table 2. The potencies on a dry 



TABLE 2 

 Relative activities of natural supplements for promoting budding in Hydra 



'Used as standard and assigned arbitrary value of 10. 



