328 



Fl 



orence 



Peehle 



order to use this method one component must be slightly smaller 

 than the other so that one end of the smaller one may be inserted 

 in an end of the larger one. The two components were usually 

 telescoped so that they lapped about one millimeter. 



I TWO LONG PIECES GRAFTED TOGETHER IN THE SAME DIRECTION 



Experiment I. The first series of experiments consisted in graft- 

 ing together two pieces from the same region of two different 

 individuals, so that the aboral end of one piece was inserted in the 

 oral end of another piece from which the hydranth had just been 



IIMIII 

 YJiMin 



Mill 



Fig. 3 Fig. 5 Fig. 7 



Fig. I. 



Fig. 2 



tint 



Fig. 4 



Fig. 6 



Fig. 8 



removed. Each piece measured about 3 cm. (Fig. i), not includ- 

 ing the hydranth of the distal piece which was not removed until 

 the day after the graft was made. The first cut (/) removed the 

 old hydranth and about 4 mm. of the stem from the distal com- 

 ponent, the second cut {2) was made through the proximal com- 

 ponent a short distance back of the line of union, and the last cut 

 (5) removed the basal end from the proximal component. These 

 three pieces (Figs, i and 2) I shall call respectively A, B and C. 

 Their individual behavior after this second operation will first be 

 considered, and then they will be compared in order to see the 

 relative rate of development of the hydranths. 



