458 T. H. MORGAN. 



the slice was taken oflF the dorsal surface, and in others off the 

 ventral. 



In a few cases no record was made. Whetlier or not the 

 injured rings complete themselves more readily at the side than 

 dorsally or ventrally cannot be determined from the table, for 

 the position of the parts cut off in the first instance was not 

 recorded. 



In connection with the preceding experiments another was 

 carried on. The anterior ends that were cut off were in many 

 cases kept alive to see what power of regeneration remained in 

 them. It became evident very soon that the length of the life 

 of the pieces was in a general way proportionate to their linear 

 length. Those with a few segments died in the course of a 

 week ; those with more lived longer, &c. No cases of survival 

 of as few segments as fifteen were ever found. The two fol- 

 lowing tables show to what extent longer pieces remained 

 alive, but with one exception (twenty-four anterior segments) 

 they all died after a time. It is surprising to find this to be 

 the case, for such pieces contain the mouth (so that the piece 

 may feed) and all of the important (?) organs of the body. 



Table XIV. 

 Record of anterior segments. 



