INHERITANCE IN ASEXUAL REPRODUCTION 



183 



Fig. 5 The mean number of tentacles of the buds produced by Clones A and D 

 during successive intervals of five days. The mean number of tentacles of 

 Clones A' and D' are included at the right as these form a natural continuation 

 of the earlier experiment. 



not greater than its probable error and is probably not signifi- 

 cant. The equality in reproductive rate is shown by the fact 

 that while no attempt was made to obtain equal numbers in the 

 two clones during the experiment, the numbers bred were, after 

 two months, almost equal (1353 and 1395). 



Other differences between the clones which can not be ex- 

 pressed quantitatively were apparent in the living animals. 

 Clone D was, as a rule, somewhat darker in color than Clone A 

 and somewhat more resistant to unfavorable conditions. Polyps 

 of Clone A showed a greater tendency to cling to the surface film 

 and were more active than those of Clone D. 



Nature of the difference between Clones A and D. The fore- 

 going data prove that the two clones studied are distinct through 

 the presence of some internal, hereditary factor. The 'Reak- 

 tionsnormen' of the two are different. But whether this differ- 

 ence is genotypic in the sense of being the result of a fixed con- 

 stitution of the germ-plasm or whether it is due to a spurious 

 heredity like that by which the green color is transmitted is not 

 clear. The agents, other than the hereditary constitution, which 

 might produce such clonal diversities are the direct action of the 



