RELATIVE STABILITY OF LIVING MATTER 



319 



segments are not restored, "and the worm remains shortened 

 throughout the rest of its life " (see Fig. 36, G, H). 



G H 



FIG. 36. Regeneration of earthworm, Allolobophora fa-tida 



A, normal worm ; B-F, regeneration after removal of one, two, three, four, and five head 

 segments respectively; G, anterior third cut off, only five segments restored; //, cu 

 in two in the middle, only five restored; /, cut posterior to the middle, tatl m 

 restored. After Morgan 



5. If the cut be far enough back to remove the reproductive 

 organs, they are never reformed, " and the worm remains inca- 

 pable of reproducing itself." 



