18 



SERGIUS MORGULIS 



C. RELATION BETWEEN SEX AND RATE OF REGENERATION 



In studying the rate of regeneration, it is urgent to guard against 

 several sources of possible error, since the conclusions are based 

 almost entirely upon comparisons. In dealing with worms one is 

 doubtless spared many pit-falls arising from the discontinuous 

 method of growth or progressive developmental changes in the 

 experimental animals. Temperature conditions, as well as the 

 factor of size (age?) of the animal and of the level of the cut, can 

 be regulated without much difficulty, and due weight has been 

 given to all these matters in the previous experiments with 

 Podarke. There was, however, one factor still uncontrolled, viz., 

 the influence of the sex of the animal upon its regenerative rate. 

 Generally it is not an easy matter to determine the sex, bat I 



TABLE 9 



