Feb., I92ll HARRIS AND OTHERS — SEEDLINGS OF PHASEOLUS 
83 
figure 16. Comparison of these figures with those in figure 15 shows essen- 
tially the same type of distribution for the dimerous and trimerous plants. 
The grades of the classes are merely about double what they were in the 
former method of treatment. 
The statistical constants are compared in table 10. 
so 
40 
30 
20 
10 
//yPOCOTYL OF Ll/^f 7S 
= JJ/METfOl/S 
= TW/iETfOUS — 
• 
-f 
9 fO II 12 
1 1 1 1 1 1 1 u 
13 14 15- /e 17 18 
' ' ' 1 1 < 1 1 1 ^ ^ . 
Fig. 17. Percentage frequency distribution of total bundles in central region of 
hypocotyl. 
For all five lines the constants show a higher mean number of bundles in 
the trimerous than in the dimerous seedlings, the mean being approximately 
12 in the former and 8 or 10 in the latter. Thus the trimerous seedlings 
have from 21.8 to 46.9 percent more bundles than the dimefous seedlings. 
