26 



THE AMEBIC AN NATURALIST 



[Vol. LIII 



is considerably higher than it was with the 202 series. 

 One reason for this may be that perhaps there is a dif- 

 ference between this series and the former or that the 

 result is caused .uToupiiiu- the three t'nmilies. AVhen 

 a correlation tal)le is made I'^r each of tlie three families 



So 



separately, correlation coefficients of .296 + 

 + .025 and .741 + ,024 are obtained. Thus it is 

 within any family correlation exists to a greater 

 degree. Putting the three families in one table 

 crease the correlation somewhat over the average 

 for each alone. Another and possibly more 

 reason is the fact that these plants are of the 

 generation, while those of 202 are of the 



39, .623 

 ee~ 

 • o 



5 



