GRAFTING AND REGENERATION 



163 



evidences of separation of the pieces was observed in cases of this 

 sort. 



In one experiment two posterior pieces were united by oblique 

 surfaces, as shown in Fig. 47, C, and one of the two was afterwards 

 cut across, as indicated by the cross-line. The subsequent re- 

 generation that took place is shown in Fig. 47, C 1 . A head, com- 



B 



FIG. 47. After King. A. Hydra split in two, hanging vertically downwards. Later the halves 

 completely separated. II. Two posterior ends united by oral surfaces. H*. Same; it regen- 

 erated two heads, each composed of parts of both pieces, ff 1 . Absorption of one piece lead- 

 ing to a later separation of halves. C. Two posterior ends united by oblique surfaces. Later 

 one piece partially cut off, as indicated by line. C\ Later still, two heads developed, one at 

 N, the other at M. D. Similar experiment in which only one head developed, at M. E. Five 

 pieces united as shown by arrows. Four heads regenerated, one being composed of parts of 

 two pieces. 



posed of parts of both pieces, developed at the cut-surface M, and 

 another in the region N'm Fig. 47, C, composed of material of one 

 component. In another ca'se, shown in Fig. 47, D, a head devel- 

 oped only at the cut-edge, but it was made up of material from both 

 components. 



A series of grafting experiments of another sort has been made 



