634 
J. ARTHUR HARRIS 
Plant I in 1 91 3, arranged according to the number of abnormal pedicels 
per inflorescence. This table is quite typical of the others which 
have been made. The bimodal distribution characterizes all the 
arrays in which the number of observations is large enough to give the 
distributions critical value. 
Differentiation between individual plants and differentiation due 
to correlation between the characteristics of the pedicels and those 
of the inflorescence would seem to be the most probable source of a 
spurious bimodality in the frequency distributions of number of 
flowers per pedicel. That neither of these factors underlies the 
observed form of the frequency distribution seems quite clear from 
the foregoing tables. Bimodiality seems rather to be due to innate 
factors operative in the morphogenesis of the individual pedicels. 
Now in examining the graphs on diagram 3 the reader will note 
that the mode on 2 flowers per pedicel is but a transition stage to the 
higher mode — not represented in the diagram — on a single flower per 
pedicel — that is to the normal condition. 
Table VI 
Distribution of Number of Flowers per Pedicel for All Pedicels 
Number of Flowers 
Series 
per Pedicel 
1909, 18 Shrubs 
1913, Plant I 
1913, Plant II 
1913, Plant III 
I 
2 
3 
4 
5 
6 
7 
8 
9 
10 
II 
12 
13 
14 
15 
16 
17 
14,250 
364 
173 
149 
121 
124 
188 
274 
373 
399 
307 
192 
85 
32 
9 
I 
8,436 
225 
94 
87 
139 
319 
580 
851 
698 
321 
79 
3 
5,196 
177 
83 
72 
87 
159 
280 
506 
601 
305 
112 
35 
9 
I 
5,714 
193 
103 
lOI 
119 
245 
367 
616 
458 
114 
22 
8 
3 
Total 
17,042 
11,832 
7,623 
8,064 
Tabulating the actual number of flowers per pedicel for all pedicels 
examined, the frequencies in Table VI are obtained. 
