Feb., I92i] HARRIS AND OTHERS — SEEDLINGS OF PHASEOLUS 
9.5 
the one hand and Hnes 98, 139, and 143 on the other is more apparent than 
real. All five lines agree in showing the frequencies for the dimerous plants 
largely concentrated in a single modal class with a slight but evident skew- 
eo 
so 
40 
30 
20 
/o 
fP/COTYL OF /.///£ MS 
• • = U/MEPOUS 
0 0 = T7?1/^ER0US 
12 /3 14- 15 16 17 18 19 20 21 
Fig. 23. Percentage frequency distribution of number of bundles in central region of 
epicotyl. 
ness toward higher numbers of bundles. In the case of lines 75 and 93 
there is a little over i percent of plants with fewer than the modal number 
of bundles, whereas in lines 98, 139, and 143 these do not occur in series of 
the numbers sectioned. It is quite possible that the examination of a 
