440 CM. CHILD 



stitution is greater in posterior than in anterior pieces of the same 

 size, provided of course that both produce new whole animals. 

 The amount of reorganization in the reconstitution of a piece 

 undoubtedly increases as the level of the piece becomes more 

 posterior. The amount of new tissue behind the head and the 

 degree of change in the alimentary tract both increase from anterior 

 to posterior pieces. In other words, the farther from the head 

 a given region of the body is, the greater the alteration it must 

 undergo when brought into direct relation with a dominant head 

 region as every piece is when a head forms at its anterior end. 



IV. SUMMARY 



1. A temporary increase in rate of metabolism, a 'stimulation' 

 lasting at least several hours, results from section. 



2. The temporary increase in rate of metabolism following 

 section varies in amount inversely as the length of the piece, long 

 pieces being very slightly or not at all stimulated and short pieces 

 strongly stimulated. 



3. The temporary increase in rate of metabolism following 

 section also varies in amount according to the region of the body 

 which the piece represents, being least in most anterior and in- 

 creasing in successively more posterior pieces. In the shorter 

 pieces this difference is sufficient to increase the rate of posterior 

 above that of anterior pieces. 



4. The differences along the axis in the stimulation from section 

 are merely special expressions of the axial gradient and the 

 antero-posterior dominance which results from it. 



5. An inverse relation exists between the frequency of head 

 formation and degree of stimulation of pieces following section. 

 The shorter or the more posterior a piece the greater the degree of 

 stimulation and the less the frequency of head formation. The 

 nature of this relation will be considered after presentation of 

 further facts. 



6. The temporary increase in rate of metabolism in the piece 

 after section is followed by a gradual fall. Twelve hours after 

 section the rate of metabolism in the pieces may be as low as, or 



