INHERITANCE IN ASEXUAL REPRODUCTION 



177 



September was 1353, of 'stem mother' Z>, 1395. The distri- 

 bution of the variations in the nuniber of tentacles, of the two 

 clones is given in table 10. The means and standard deviations 

 computed from these figures are: 



The difference between the average numbers of tentacles borne 

 by polyps from the two clones is here many times its probable 



TABT.E 10 



The disirihiUio7i of variatio7is in the number of tentacles of the descendants of 'stem 



mothers' A and D 



error and proves that the two clones differed either in their 

 hereditary constitution or in the environment to which they were 

 subjected. The conditions of the experiment seem to rule out 

 the latter possibility and further evidence against an environ- 

 mental cause of the difference was given by further experiments 

 with the clones. The second part of the experiment, beginning 

 with the establishment of the two subordinate clones A' and D', 

 from single individuals taken out of mass cultures gave 204 

 pedigreed descendants from stem mother A' and 153 descendants 

 of stem mother D'. The number of tentacles of these polyps 

 is shown in table 11. The constants for the distributions given 

 are: 



