Feb., 1921I HARRIS AND OTHERS — SEEDLINGS OF PHASEOLUS 
85 
In variability as measured by coefficient of variation, the dimerous 
plants exceed the trimerous throughout, conspicuously so in lines 75, 
93, and 98. In their standard deviation, the dimerous also markedly 
exceed the trimerous in these three lines, but in lines 139 and 143 the 
trimerous plants slightly exceed the dimerous. 
10 
60 
SO 
40 
30 
20 
10 
//yPOCOTVl OF///^f 93 
V 
= JIIAIEBOUS 
-= TRIAIfffOUS 
1 
\ 
i 
1 
6 
8 10 II 12 13 14 I'S Fe 17 18 19 
Fig. i8. Percentage frequency distribution of total bundles in central region of 
hypocotyl. 
D. Summary for Base of Hypocotyl. For the base of the hypocotyl, 
therefore, it is evident that in total bundle number the trimerous seedlings 
decidedly exceed the dimerous ones. The intercalary bundles alone (which 
form but a small part of the total) tend to be more numerous in the dimerous 
seedlings. 
