Grafting of Tuhularia 3^1 



This table shows that the small piece if isolated before any of 

 the processes preparatory to hydranth formation are begun, is 

 not only capable of forming a complete hydranth, but in a large 

 proportion of cases it does form the complete structure. The 

 length of time between the operations and also the size of the tip 

 removed are factors in determining the extent of later regeneration 

 in the end of the piece. 



The later behavior of the proximal piece (Fig. 20, B) is given 

 in the following parallel series where the tip was removed before 

 the ridges appeared. 



SERIES I B 



Old proximal row retained, new distal in front lo 



New anlage i r 



Total number 2C 



It will be seen upon comparing this series with Series i A in 

 each there were ten pieces that retained the original tentacles that 

 had been laid down; these ten pieces were parts of the same piece 

 before the second operation. The fifteen proximal pieces in 

 Series i B which formed entirely new primordia, developed on their 

 original tips five complete hydranths, while ten died without any 

 further development. 



SERIES 2 B 



Old proximal row retained, new distal in front o 



New anlage 15 



Total number 22 



Again it will be seen by comparing this series with Series 2 A 

 that some of the proximal and distal pieces retained the original 

 anlage which had been started before the second operation, the 

 larger number, however, developed a new anlage. Series 3 and 

 5 B will not be given as the pieces developed new hydranths in the 

 usual way. 



In the fourth series, the second operation was postponed until 

 after the proximal ridges were discernible, but the distal had not 

 jet appeared. 



