Physiology of Regeneration 605 
Sz AL HK 
a a er 
12 16 20 24 days 
Fig. 3 The obliquely striated columns represent the number of segments regenerating for equal 
periods, of four days each, at the anterior level. The horizontally striated columns represent the incre- 
ments in the /ength of the regenerating tails for the same periods of time. The Roman numerals refer 
to the number of regenerated segments, while the Arabic numerals to the length of the regenerated tails 
in mm. 
Fig. 4 Same as Fig. 3, but for worms regenerating at a more posterior level. 
