O C. M. CHILD. 



through the side of the ring on which the disc appeared; it shows 

 the formation of the column beneath the disc. After twenty-five 

 days the old tissues of the ring began to show signs of disintegra- 

 tion and the new individual was either poisoned or infected by 

 the dead and putrefying tissue, and died. In no case thus far 

 has it been possible to keep these outgrowths of the rings per- 

 manently alive, for the parts not involved in the new outgrowths 

 always degenerate sooner or later and finally kill the new parts. 

 In the case just described it was my intention to separate the 

 new individual from the ring in order that it might if possible 

 complete its development, but death occurred before this was 

 done. If the opportunity of still further experiment arises, I 



5 



FIGS. 5-6. 



shall try the experiment of separating some of these adventitious 

 buds, for they are such, from other parts of the ring. I have no 

 doubt that under proper conditions they can be kept alive and 

 fed so that development will proceed. 



This case as it stands is, however, sufficient to demonstrate 

 that new polarities may arise from these rings, from which the 

 old polarity is in large measure eliminated. As was pointed out 

 in my earlier paper, this is a form of reproduction which resembles 

 more or less closely certain cases of the formation of adventitious 

 structures in plants. Moreover, there can be no doubt that 

 each new polarity arises in relation to local conditions in the 

 growing tissues along the line of union between the original oral 

 and aboral ends of the piece, though exactly what these condi- 

 tions are, we do not at present know. 



In the course of my experiments a large number of other 

 adventitious tentacle groups was obtained, many of them with 



