200 



K. S. LASHLEY 



correlation of Clone A shows that the high parental correlation 

 is not wholly the result of the mixture of two races in Clone A. 

 Computation of the parental correlation for the two subordinate 

 clones confirms this, giving the following coefficients: 



Coefficient of correlaliim 



Clone AlA .009 ±0 . 106 



Clone A - {AlA) 0.255±0.063 



After this division the correlation is still significant and is 

 four times as great as that found for Clone D. An examination 

 of the data for possible environmental causes of correlation 



96 



72 



.24. 



D 20 30 40 50 60 70 Days 



Fig. 10 Changes in the average size of the buds produced during successive 

 ten-day intervals by Clones A and D. The ordinates represent the mean sizes 

 in cubic millimeters of all measured buds produced during each ten-day period ; 

 the abscissae, the successive ten-day periods. 



gives the result shown in figure 10. As in the case of the number 

 of tentacles, there was a considerable change in the mean size 

 of the buds produced at different times during the experiment. 



The correlations between all buds produced in each of the 

 five-day intervals were: 



Coefficient of correlation 



Clone D 0.0118 



Clone A - {AlA) 0.0952 



There is here the same difference in the size of the correlations 

 of the two clones which appeared in the parental correlation but 



