eb., 1921] HARRIS AND OTHERS SEEDLINGS OF PHASEOLUS 



77 



The percentages of the seedlings with no intercalary bundles in the two 

 ilasses of plants and the differences in the percentage are as follows : 



The physical constants in table 6 show that the mean number of inter- 

 alary bundles in both normal and abnormal seedlings is small less than a 

 single bundle per plant in every case. 



TABLE 6. Statistical constants for number of intercalary bundles at base of hypocotyl of 

 trimerous plants and their normal controls 



Again the lines fall into two classes, those in which the number of inter 

 calary bundles is conspicuously higher in the dimerous plants (lines 75, 

 93, and 98) and those in which the numbers are essentially identical (lines 

 139 and 143). In the trimerous seedlings of the first group the average 

 number ranges from 0.13 to 0.25, whereas in the dimerous it varies from 

 0.60 to 0.83 bundle. Thus the mean number of intercalary bundles is 



