HARRIS: INTERRELATIONSHIP IN PHASEOLUS 



171 



difference between the sample and the control is —.0813. 

 ences in average weight vary from +.0368 to —.2492. 



The differ- 



Table I 

 Mean Green Weight per Plant of Primordial Leaves and of First Compound Leaf 



If these differences be reduced to percentages by using the w^eight 

 of the normal plants as a base, as shown in the final columns of each 

 section of the tables, it appears that the primordial leaves of the 

 morphologically aberrant plants are from 3.0 to 18.0 percent lighter 

 than the leaves of the normal plants in the 22 samples in which this 

 relationship between the two types of plants holds for the primordial 

 leaves. Thus the percentages are highly variable. The average for 

 the 23 determinations is 11.95 percent. In the case of the first com- 

 pound leaves, the percentage reduction ranges from 4.1 to 34.6 with 

 an average of 14.06 in the 23 samples. Note that the percentage 

 shows that the difference between the abnormal and the control sample 

 is far less in the case of the single exception, sample 47, than it is in 

 the average series. Thus it is only i.i as compared with an average 

 .value of 11.95 for the primordial leaves and only 6.7 as compared 

 with the average of 14.06 percent in the compound leaves. 



I now turn to a consideration of dry weight. 



