Grafting of Tuhularia 



343 



emerged from the oral end of the longer piece, a region which was 

 nearer the basal end than the short piece. The number of experi- 

 ments was almost too small to warrant any definite conclusion. 

 I have repeated this experiment a number of times and have finally 

 come to the conclusion that the major component does not in- 

 fluence the minor one unless it shares in the formation of the 

 hydranth which develops at that end. 



i . 



Fig 17 Fig. iS 



Experiment i. A short piece measuring about 1.5 mm. was 

 cut from the distal end of a long (3 cm.) piece from a region near 

 the hydranth. This small piece was then grafted on the aboral 

 end of the long piece (Fig. 17) so that the oral end of each piece 

 was exposed, the aboral ends united. Twenty-seven grafts are 

 represented in Table 14. The dotted Hne shows the original 

 position of the small piece. 



TABLE 14 



Eleven of the twenty-seven grafts formed a hydranth first at 

 the oral end of the major component (P), and later at the oral end 



