Factors m Regeneration 323 



TABLE 5 

 Polyps regenerated 



on 2 days 5 days 



foral ends 60% 60% 



Distal third of stem {,,, ^, ^ 



1 basal ends 30% 100% 



foral ends 80% 100% 



Middle third of stem < , , , ^ ^ 



|basal ends 40% 70% 



foral ends 70% 100% 



Basal third of stem {,, , ^ ~ 



1 basal ends 20% 30% 



With distal pieces excepted, the branchless parts of a stem regen- 

 erate decidedly more hydranths at the apical end than at the 

 opposite or basal end. 



Experiment 6. The above results contrast sharply with those 

 in this experiment in which only lateral branches from different 

 regions of the stem were used. 



TABLE 6 



Polyps regenerated 



on 2 days 5 days 



•D , r ,■ , r /oral ends 12% 37% 



Branches from distal part of stem i , . , 



1^ basal ends 37% 50% 



T, , , .,,, , f , /oral ends 12% 12% 



Branches trom middle part 01 stem { . , , 



1 basal ends 62% 112% 



foral ends 25% 37% 



Branches from basal part of stem n , , , 



l^basalends 37% 87% 



The lateral branches from any level of a stem produce a far 

 greater number of heteromorphic than apical polyps.^ Under the 

 caption " ccenosarc " this will be explained. 



Experiment y. In Experiment 6 all secondary branches were 

 removed. In the following experiment these were not removed 

 nor were the polyps amputated. The regeneration at the basal 

 and apical ends only was recorded. While the polyps were dis- 

 integrating, stolons wer^ forming at all the basal cut ends, fasten- 

 ing the pieces to the bottom or sides of the dish. Later stolons 

 were present on several pieces at both oral and basal ends. These 

 stolons often grew to a remarkable length as long as or longer 

 than the original specimen. Usually they gave rise to several 

 branching stolons which regenerated one or more polyps, even as 



^Driesch, Morgan and Stevens found that the apical ends of pieces taken from any region were first 

 to regenerate and produced a greater number of polyps than the basal ends. 



