328 A. J. GoUfarb 



TABLE 12 



Polyps regenerated 



■^'^ " ■^ days 6 days 



on 



Oral ends 9% 39% 



Basal ends i6% 52% 



In these pieces, each about i mm. long, more basal polyps are 

 produced. A considerable number of internodes formed hy- 

 dranths at each end, in some cases simultaneously. This fact indi- 

 cates that some of these very short pieces had the potency to pro- 

 duce more than one hydranth. The majority regenerated but a 

 single polyp. Regional differences were not apparent in this 

 experiment. It cannot be said, for example, that regeneration was 

 retarded or accelerated, increased or decreased in one region more 

 than in another; nor was the formation of basal hydranths pecu- 

 liar to any one region or level. 



From these experiments we conclude that in the small pieces 

 mentioned, a greater number of heteromorphic than apical polyps 

 are produced; that this increase is not associated with any particular 

 level of the stem; that oral polyps are rarely formed on distal pieces, 

 though many regenerate on pieces from middle and basal regions 

 of the stem. 



Experiment 12. To determine whether rapid growth first in one 

 direction then in the opposite direction, could be effected, the 

 new basal stems from a number of pieces were removed, viz: 

 B pieces of the diagram. There developed from the basal end b, 

 of these basal stems many hydranths which grew with remark- 

 able celerity in the original direction toward a; there also regen- 

 erated actively polyps at the oral (c) and the lateral ends of the B 

 pieces. There was no reason to doubt that the removal of the C 

 pieces would result in the formation of hydranths at the new 

 basal end of C. If lateral branches instead of basal branches 

 be repeatedly removed the results are essentially the same. The 

 actual figures are given below^: 



TABLE 13 



Polyps regenerated on basal pieces of i? 3 days 6 days 9 days 



Oral ends 0% 26% 53% 



Basal ends 33% 40% 53% 



Polyps regenerated on basal ends of lateral branches 



Oral ends 6% 36% 46% 



Basal ends 0% 23% 50% 



