Regeneration in Liiinhri cuius 



563 



And for the third period: 



0.8 0.8 ,0.6 



—^=1.3; = 1.6; = 1.2, or 



0.6 ^ 0.5 0.5 



TABLE VI 



Experiment IF. Another experiment was started on November 

 29. A number of worms were cut into seven pieces each, as in 

 the previous experiment. Pieces of corresponding levels were 

 kept in the same dish. The dishes contained nothing but filtered 

 water. No food was present. The pieces will be named accord- 

 ing to the level of the body B^, B2, B3, B^, B5, Bg. 



The worms used in this experiment had been in the laboratory 

 for some weeks, so that their regenerative capacity was consider- 

 ably lessened. In general worms just brought in from the pond 

 are the best as far as their regenerative power is concerned, and 

 lose it when kept in the laboratory. 



I regret that I did not take the record of the amount of 

 regeneration at the end of the first two weeks, as it would be very 

 interesting in connectign with the results obtained from this experi- 

 ment. 



At the end of four weeks (December 27) the pieces were exam- 

 ined, the segments counted, and their numbers are given in Table 

 VII. 



This table shows practically the same result in regard to the 

 relation of the regenerated to the old tissue, and that of the former 

 to the level of the worm's body, as the Tables III, IV and V. 



In this case, however, the regenerated tissue was not removed, 

 and the pieces were left regenerating till January 10, 1907, or for a 

 total of six weeks. Table VIII gives the result of counting the 

 segments at the end of six weeks. 



The number of new segments is the same as at the end of four 



