INHERITANCE IN ASEXUAL REPRODUCTION 



199 



the data given in figure 9 shows that this is not the case. There 

 is no difference between the averages of the seventh and of the 

 eighth buds of the two groups and all parents produced at least 

 eight buds. 



The likeness of this result to that obtained from regenerating 

 polyps (fig. 3) is very striking and there can be little doubt that 

 it is due to the same cause, a reduction in the vitality of one of 

 the groups compared. Selection of polyps with few tentacles 

 resulted in the selection of those with low vitality and as soon 

 as these were given time to regain their health they produced 

 buds varying around the mean of the race. Selection produced 

 no permanent change in the type of the clone studied. 



Inheritance of size 



From the measurements of the- size of polyps in Clones A 

 and D the correlations in size between parents and offspring and 

 grandparents and grandchildren within these clones were com- 

 puted. These coefficients are given in table 23. In every 

 case they are positive and the parental correlation of Clone A 

 is very high, more than six times that of Clone D. The grand- 

 parental correlations are negligible but the low grandparental 



TABLE 23 

 Ancestral correlations for size 



